Question 979609
Assume that boys are x then the girls are x+8. since their ratio is 3/5 we write:

{{{x/(x+8)=3/5}}} solving this equation for x different then 8 we get:

{{{5x=3(x+8)}}}
{{{5x-3x=24}}}
{{{2x=24}}}
{{{x=12}}}
The boys are 12 and the girls 12+8=20.