There are 72 members in the School Choir. 45 of the members are girls and the rest are boys. What is the ratio of the number of boys to the number of girls?
- 3 : 8
- 5 : 3
- 3 : 5
- 27 : 72
Need a hint?
Find the number of boys first, then write boys first and girls second, and simplify.
Worked answer
- Boys = 72 − 45 = 27
- Ratio of boys to girls = 27 : 45
- Divide both numbers by 9: 27 : 45 = 3 : 5
Answer: 3 : 5
The mistake this question tests
Habit
Simplest form in final fraction answers
Pupils often compare the boys with the whole choir (3 : 8) or reverse the order of the ratio (5 : 3) instead of writing boys to girls.
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See the answer →Practise PSLE ratio until the mistakes stop.
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