The ratio of boys to girls in a class is 4 : 5. If there are 20 girls, how many pupils are in the class?
A40
B36CORRECT
C25
D45
Common EntranceMathematicsRatio
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Why the answer is B, and why the others tempt you.
5 parts = 20 girls, so 1 part = 4. Boys = 4 x 4 = 16. Total = 16 + 20 = 36 pupils.
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