Question

The ratio of girls to boys in a swimming club was 3 : 2. There were 15 girls. How many boys where there in the club?

Answer 1

`\bf \cfrac{girls}{boys}\qquad 3:2\qquad \cfrac{3}{2}~\hspace{3.2em}\cfrac{15}{b}=\cfrac{3}{2}\implies 30=3b\implies \cfrac{30}{3}=b\implies 10=b`

Answer 2

10 boys

Explanation:

Ratio of girls to boys was 3:2

That means, If there are 3 girls,

then there will be 2 boys.

Now, when there are 15 girls,

that is girls number is multiplied by 5 , since 3x5=15

Then boys number will also be multiplied by 5.

So,

Total number of boys will be=2x5=10