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There are 40 pupils IN THE CLASS class. If the ratio of numbers is 3:5, fIND THE NUMBER OF BOYS AND GIRLS.

Sagot :

This is a kind of a problem that includes partitive proportion. 
3 + 5 = 8
40 ÷ 8 = 5

5 × 3 = 15
5 × 5 = 25

Therefore, the ratio will become 15:25 = 3:5

Check:
15 + 25 = 40

Also, your problem is incomplete but it's okay.. we have no ideas if the ratio of 3:5 is the ratio of boys to girls or girls to boys.