The Ratio of boys to girls was 3 to 7. If there were 40 more girls boys in 2016 how many boys were enrolled that year?

Answer 1

How can you hope to solve this math problem when you don't know what subject this is??

Answer 2

g = b+40

b/g =3/7 so b =3g/7

so
g = 3g/7 +40
7g/7 = 3g/7 + 40
4 g = 40*7
g = 70
b = 3*70/7 =30