O-LevelMathematicsNumber4024/12 · Oct/Nov 2025 · Q95 Marks
Sara has a bag containing 60 red counters, 72 blue counters and 36 green counters. Find the ratio of red counters : blue counters : green counters in the bag. Write the ratio in its simplest form.
- (a)Sara has a bag containing 60 red counters, 72 blue counters and 36 green counters. Find the ratio of red counters : blue counters : green counters in the bag. Write the ratio in its simplest form.[2]
- (b)Sunil has a bag containing yellow counters and white counters. The ratio of yellow counters to white counters is 5 : 8. There are 18 more white counters than yellow counters. Work out the number of yellow counters and the number of white counters.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2025). The mark or mark type is shown in brackets.
- [2] (a) 5 : 6 : 3
- [2] (a) M1 for correct simplified ratio e.g. 30 : 36 : 18 or better seen
- [3] (b) [yellow = ] 30
- [3] (b) [white = ] 48
- [3] (b) M2 for (18/(8-5)) x k oe where k = 5 or 8
- [3] (b) M1 for 18/(8-5) oe
- [3] (b) M1 for x/(x+18) = 5/8 oe
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