Cambridge A Level Thinking Skills 9694 — 2015 Oct/Nov Paper 1 · Variant 3

This document consists of 18 printed pages and 2 blank pages. IB15 11_9694_13/4RP © UCLES 2015 [Turn over *4838347988* Cambridge International Examinations Cambridge International Advanced Subsidiary and Advanced Level THINKING SKILLS 9694/13 Paper 1 Problem Solving October/November 2015 1 hour 45 minutes Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. There are 30 questions on this paper. Answer all the questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in pencil on the separate answer sheet. Read very carefully the instructions on the answer sheet. Ignore responses numbered 31 – 40 on the answer sheet. DO NOT WRITE IN ANY BARCODES. INFORMATION FOR CANDIDATES Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

2 © UCLES 2015 9694/13/O/N/15 1 I am planning to buy a new house and have been given four options to consider by the estate agent. My ideal house would have at least 3 bedrooms, a large kitchen and a garage. I also want to live within 5 km of my work. I will consider any houses that satisfy three of the four conditions. The details of the houses that I have been given are below. Address Size of kitchen Number of bedrooms Garage Distance from work 22 Station Road Small 5 Yes 4 km 6 Church Lane Large 3 Yes 7 km 15 Main Street Small 4 No 2 km 7 Park Avenue Large 2 Yes 3 km Which is the house that I will not consider? A 22 Station Road B 6 Church Lane C 15 Main Street D 7 Park Avenue 2 In Bolandia, the streets are constructed from 10-metre pieces. A lamppost must be placed at both ends of every completed street and at points every 10 metres along its length. Additional lampposts must also be placed at every notice board along the road. Einstein Street, in Bolandia, has 7 notice boards, and 42 lampposts were needed altogether. How long is Einstein Street? A 330 metres B 340 metres C 350 metres D 360 metres

3 © UCLES 2015 9694/13/O/N/15 [Turn over 3 Which of the following shapes, when rotated, would fit together with the shape given above to form a rectangle? A B C D

4 © UCLES 2015 9694/13/O/N/15 4 The bill for my shopping came to $20. I bought four items, all at different prices and all whole numbers of dollars, but all I can remember is that one cost $6 and three of the prices were consecutive numbers. Which of the following was one of the prices? A $1 B $2 C $3 D $4 5 In the year 1920, on the morning of his 71st birthday, Ben recorded in his diary that he had visited the graves of two friends. Andy 1848-1919 Eilidh 1848-1920 Which one of the following statements must be true? A Andy lived longer than Eilidh B Ben was born after both Andy and Eilidh C Andy and Eilidh died within 12 months of each other D Andy, Ben and Eilidh all died at the same age

5 © UCLES 2015 9694/13/O/N/15 [Turn over 6 The table below gives the shortest time in minutes that it takes to travel between different locations in a village. Supermarket Coffee shop Sarah’s house Library Park Jane’s house 6 7 20 9 2 Park 8 7 23 14 Library 5 6 14 Sarah’s house 18 17 Coffee shop 12 Jane wants to meet Sarah as soon as possible and they are both about to leave their houses. At which location are Jane and Sarah able to meet soonest? A Coffee Shop B Library C Park D Supermarket 7 At a recent televised snooker match between James Hoopoo and Ron Knight, a viewer phone-in was held to vote on which player was the better tactician. Ron scored only 24%. If this figure has been given to the nearest 1%, what is the smallest number of votes that could have been cast? A 4 B 17 C 25 D 33

6 © UCLES 2015 9694/13/O/N/15 8 Volunteers are needed to prepare for a coffee morning. The kitchen is available for 3 hours and 20 large and 700 small cakes are needed. 1 volunteer can make either 2 large or 35 small cakes in each hour. How many volunteers are required? A 7 B 10 C 11 D 20 9 I am travelling on a train when another train passes on a parallel track. I note the time taken between the front and the rear of the other train passing my window. Which one of these pieces of information is irrelevant when working out the speed of my train? A The length of my train B The length of the other train C The speed of the other train D Whether the passing train was going in the same or in the opposite direction to mine 10 Although they are unaware of each other, both Pat and Kim will soon be attempting to walk the full length of the Yanglow Trail, which stretches for 372 kilometres between Sidneth and Farden. Pat will leave Sidneth on the 1st of next month, and intends to walk 25 kilometres each day. Kim is going to start from Farden 3 days later, and intends to walk 35 kilometres each day. If they both walk their intended distances each day, on what day next month will Pat and Kim meet each other on the Yanglow Trail? A 5th B 8th C 10th D 11th

7 © UCLES 2015 9694/13/O/N/15 [Turn over 11 Mara is preparing for a half marathon. Her training schedule lasts 10 weeks up to the race and she has set the following target distance per week: Week 1 2 3 4 5 6 7 8 9 10 Distance (km) 20 30 40 50 60 70 80 70 50 30 Which of the following graphs shows the average weekly distance she has done from the start of training to the end of the week shown? 90 80 70 60 50 40 30 20 10 0 1 2 3 4 5 Week 6 7 8 9 10 Weekly average (km) A 90 80 70 60 50 40 30 20 10 0 1 2 3 4 5 Week 6 7 8 9 10 Weekly average (km) B 90 80 70 60 50 40 30 20 10 0 1 2 3 4 5 Week 6 7 8 9 10 Weekly average (km) C 90 80 70 60 50 40 30 20 10 0 1 2 3 4 5 Week 6 7 8 9 10 Weekly average (km) D

8 © UCLES 2015 9694/13/O/N/15 12 The table below shows Annabel’s mobile phone costs for a year. Her contract gives her 50 free minutes and 250 free texts per month included in her monthly standing charge. At some point during the year, the phone company changed the tariff to charge more per minute, but reduced the monthly fee. Minutes Texts Cost ($) Jan 75 120 25.00 Feb 80 140 26.00 Mar 60 160 22.00 Apr 95 150 29.00 May 100 180 30.00 Jun 95 160 29.00 Jul 90 150 28.00 Aug 80 120 24.00 Sep 65 110 19.50 Oct 90 140 27.00 Nov 105 120 31.50 Dec 130 100 39.00 In which month was the tariff changed? A May B August C September D November

9 © UCLES 2015 9694/13/O/N/15 [Turn over 13 A 24-hour digital clock of mine behaves very strangely. It displays the correct four digits at all times, but in descending numerical order. For example, at 08:11 its appearance is At present it is showing Which of the following could not be the display one minute from now? A B C D

10 © UCLES 2015 9694/13/O/N/15 14 Last week students at a local school collected money for a charity. The collections started well and on Monday they had collected one third of the money that they needed to raise. Tuesday was not such a good day and they collected only half of the total that had been collected on Monday. On Wednesday one of the group was ill and so they could not collect as much money as they had on Tuesday. On Thursday they managed to match the collection from Monday. On Friday they collected the remaining money that was needed to reach their target in the morning and then they stopped making collections. Which of the following bar charts shows the total amount of money raised at the end of each day? Mon Tue Wed A Thu Fri Mon Tue Wed B Thu Fri Mon Tue Wed C Thu Fri Mon Tue Wed D Thu Fri

11 © UCLES 2015 9694/13/O/N/15 [Turn over 15 I am going to tile my kitchen floor. I want to ensure that all the tiles are the same size and that there are no gaps. The floor is rectangular, measuring 4.5 m x 3.6 m. There are four sizes of tile that I can choose from, as follows: Tile size Number in pack Price per pack 30 cm x 30 cm 15 $35 40 cm x 25 cm 12 $30 40 cm x 30 cm 10 $28 40 cm x 40 cm 8 $25 Tiles can only be bought in full packs. I want to keep the cost to a minimum, but I don’t want to cut any tiles to fill in gaps. Which size of tile should I buy? A 30 cm x 30 cm B 40 cm x 25 cm C 40 cm x 30 cm D 40 cm x 40 cm 16 Customs officers at Kontrabandia’s main airport operate two checkpoints. At the first checkpoint they stop and search 1 out of every 4 passengers in the queue. At a second checkpoint they search 1 in 5 of all those not searched at the first checkpoint. Of 400 passengers arriving, 5% are trying to smuggle goods. How many of these are likely to get though without being searched? A 8 B 9 C 11 D 12

12 © UCLES 2015 9694/13/O/N/15 17 A painter mixes 6 litres of red paint with 5 litres of blue paint, but then realises that she meant to do it the other way round. How much blue paint must she now add to the mixture to produce the exact colour that she wanted? A 1 litre B 2 litres C 2.2 litres D 2.4 litres 18 Four friends, all 23 or 24 years old, wish to join a tennis club together. There are three equally good clubs very close to where three of the friends, Ann, Butch and Cassie, live. Don lives 40 kilometres away. Butch is still in full time education taking a higher degree, while the other three have left their student days behind them and are pursuing their various careers. Cassie is in the entertainment business and can play tennis in the daytime on weekdays only. Apart from Cassie, the friends all insist on being able to play on evenings and weekends as well as on weekdays. Annual membership rates differ for the various categories of membership at each of the clubs. The prices of these are in the table below. Victoria Tennis Granville Tennis Brooke Tennis Adult $170 $115 $90 Young person (18 to 24) $85 $115 $85 Full-time student $66 $70 $50 Child (under 18) $41 $70 $30 Country member (residing more than 30 km away) $66 $55 Off-peak (playing 09:00 to 18:00 Mondays to Fridays) $90 $70 Sunday Club (Sunday afternoons only) $56 What is the least total amount that the four friends must pay to join the same club and play tennis when they want to? A $302 B $305 C $307 D $310

13 © UCLES 2015 9694/13/O/N/15 [Turn over 19 The diagram shows the net of a triangular pyramid. Which of the following could be a view of the triangular pyramid? A B C D 20 A container is in the form of a cylinder. On the base of the container there is a tap and initially the container is full of water. Jenny opens the tap and water begins to leave the container at a constant rate. When the cylinder is half full, Jenny begins to pour water in at the top of the container at a constant rate that is 0.75 times the rate at which water is leaving via the tap. When the cylinder is nearly empty, Jenny closes the tap, but continues to pour water in at the same constant rate as before, until the container is full again. Which of the following graphs best represents the height of the water in the container over time? Height of water Time C Height of water Time D Height of water Time A Height of water Time B

14 © UCLES 2015 9694/13/O/N/15 21 The diagram below shows 8 students, represented by dots, and which of three courses – Financial Skills, Ethics in Business, and Marketing – they are studying at a university. Financial skills Ethics in business Marketing Which table below shows the courses which these 8 students are studying? A B Student Financial Skills Ethics in Business Marketing Student Financial Skills Ethics in Business Marketing Alex 9 Alex 9 9 9 Leillah 9 9 9 Leillah 9 Mark 9 Mark 9 9 Nick 9 9 Nick 9 9 Radiyah 9 9 Radiyah 9 9 Rita 9 9 Rita 9 9 Stef 9 9 Stef 9 9 Tim 9 9 Tim 9 C D Student Financial Skills Ethics in Business Marketing Student Financial Skills Ethics in Business Marketing Alex 9 9 Alex 9 9 9 Leillah 9 Leillah 9 9 Mark 9 9 Mark 9 9 Nick 9 9 Nick 9 9 Radiyah 9 9 Radiyah 9 Rita 9 9 Rita 9 Stef 9 9 Stef 9 9 Tim 9 9 Tim 9

15 © UCLES 2015 9694/13/O/N/15 [Turn over 22 When asked for $3.53 at a shop yesterday, I pulled the loose change out of my pocket to discover that I had the following coins: 2 × $1 3 × 50¢ 4 × 20¢ 3 × 10¢ 2 × 5¢ 1 × 2¢ 5 × 1¢ I decided to pay the exact amount from this loose change, using as many coins as possible, to lighten the load in my pocket. How many coins did I have left after I had paid for my purchases? A 4 B 5 C 6 D 8 23 Two different types of cake are on sale at prices of 30¢ and 40¢ each. The cakes that are being sold for 30¢ cost 20¢ to make and the ones for sale at 40¢ cost 25¢ to make. No cakes can be kept to be sold the next day, so all of the cakes are reduced to half price 2 hours before the sales finish. All of the 30¢ cakes sold out before any of the prices were reduced, and all of the 40¢ were eventually sold, even though only half had been sold when the price was reduced. The overall profit at the end of the day was $30, but it could have been $40 if all of the cakes had sold before the prices were reduced. How many of each type of cake were there in the sale? A 150 cakes at 30¢ and 50 cakes at 40¢ B 150 cakes at 30¢ and 100 cakes at 40¢ C 200 cakes at 30¢ and 50 cakes at 40¢ D 250 cakes at 30¢ and 100 cakes at 40¢

16 © UCLES 2015 9694/13/O/N/15 24 The retirement age in Bolandia will be raised from 66 to 67 over two years: every six months the minimum age will jump up by 3 months. Anyone over the retirement age on the date they apply will immediately get a free retired-person’s bus pass. How much younger could one person with a free retired-person’s bus pass be than someone not able to get one? A It’s not possible to be younger B Just under 3 months C Just under 6 months D Just under 1 year 25 An ice cream seller, in a park, consistently sells between 500 and 600 ice creams in an evening. He has five different ice creams on offer. They vary in popularity. He estimates that any evening between 25% and 35% of customers ask for strawberry, between 20% and 30% chocolate, 15% and 25% vanilla, 10% and 20% raspberry, and 5% and 15% pistachio. If the ice cream seller’s estimates are correct, what is the minimum stock of ice creams that he should carry every evening to ensure that all his customers get the flavour they ask for? A 600 B 625 C 700 D 750 26 Patrick has a savings account into which he puts $500 on the 15th day of each month. On the last day of each month the bank pays him interest of 1% on any money that was in the account for the whole of the month. Immediately after the interest had been paid at the end of January, Patrick had exactly $3000 in his account. Immediately after the interest had been paid at the end of February, Patrick had exactly $1510 in his account. Patrick only withdrew money from his account once in February, on the 10th. How much did he withdraw? A $1990 B $2000 C $2010 D $2020

17 © UCLES 2015 9694/13/O/N/15 [Turn over 27 Six student friends were discussing their favourite musical composer. Two chose Bach, two chose Mozart and two chose Verdi. Anne, who chose Verdi, was surprised that none of Charles, Ethel and Fred chose Verdi. Equally, Fred was surprised that Anne, Buzz and Charles did not choose the same as him. Which of the following sets of information, on its own, would be sufficient to enable one to be certain of all six students’ favourite composers? A Buzz chose Verdi and Charles chose Bach B Buzz chose Verdi and Dave chose Bach C Charles chose Bach and Fred chose Mozart D Dave chose Bach and Fred chose Mozart 28 Amy, Bess and Curly were the three candidates for election to President of the Gumley Players. The voting system is a little unusual. A voter can choose either to give 5 points to one candidate and 0 to the other two, or to give 4 points to one candidate, 2 points to another and 0 to the third. Twenty people voted and the total points scored by each candidate were as follows: Candidate Total points Amy 60 Bess 36 Curly 7 Amy was elected and it turned out that 13 of the voters gave her points. How many voters gave 5 points to Bess? A 2 B 4 C 6 D 7 29 There is an escalator in the underground station which I use on my way to work. I normally climb the escalator at 1 step per second, and at 1 pace per second. This takes me 15 paces to reach the top. Sometimes (if I am in a hurry) I still take 1 pace per second but climb 2 steps with each pace. This takes me 12 paces to reach the top. One day, the escalator has broken down and I walk up 1 step at a time. How many steps are there? A 33 B 36 C 54 D 60

18 © UCLES 2015 9694/13/O/N/15 30 One of the exhibits in the Hirmin Gallery of Modern Art is called “Pot Luck”. It consists of paint pots in 9 stacks, each stack containing a different number of pots between 1 and 9 inclusive. From above its appearance is: X Y Side-on, from directions X and Y, it appears as follows: from X from Y How many pots are there in the stack nearest to the viewer in the appearance from direction Y? A 1 B 4 C 6 D 9

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® IGCSE is the registered trademark of Cambridge International Examinations. CAMBRIDGE INTERNATIONAL EXAMINATIONS Cambridge International Advanced Subsidiary and Advanced Level MARK SCHEME for the October/November 2015 series 9694 THINKING SKILLS 9694/13 Paper 1 (Problem Solving), maximum raw mark 30 Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2015 series for most Cambridge IGCSE®, Cambridge International A and AS Level components and some Cambridge O Level components.

Page 2 Mark Scheme Syllabus Paper Cambridge International AS/A Level – October/November 2015 9694 13 © Cambridge International Examinations 2015 Question Number Key Question Number Key 1 C 16 D 2 B 17 C 3 A 18 A 4 B 19 D 5 B 20 A 6 B 21 B 7 B 22 B 8 B 23 D 9 A 24 B 10 B 25 D 11 C 26 B 12 B 27 D 13 A 28 C 14 D 29 D 15 C 30 C