Answer:
Step-by-step explanation:
Let G and B be the number of girls and boys.
The ratio boys to girls was 4 to 7.
This means
B/G = 4/7
There were 300 more girls than boys.
This means
G = B+300
Replace in the first equation and solve for B
B/(B+300) = 4/7 ===> 7B = 4(B+300) ===> 7B = 4B + 1200 ===>
===> 7B-4B = 1200 ===> 3B = 1200 ===> B=1200/3 ===> B=400
G = B+300 ===> G = 400 + 300 ===> G=700
