O-LevelMathematicsNumber4024/12 · May/June 2022 · Q103 Marks
A bag contains red balls, blue balls and green balls. The ratio red : blue = 3 : 8. The ratio green : blue = 2 : 5. Work out the fraction of the balls that are blue.
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [3] 40/71 B2 for 15:40:16 oe seen or for 40 : 71 or M1 for attempt to equate number of blue in the two ratios or for 71 seen or for r/g = 15/16 soi
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