Mathematics for IGCSE & O level - Ratio And Proportion (Section 2 - No. 20)
In a class, the ratio of boys to girls is 3:2. If there are 10 girls, how many boys are there?
6
10
15
20
Explanation
B:G = 3:2. 10 girls is 2*5, thus 3*5= 15 boys.
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