Question

there are 480 7th graders at bowman. the ratio of girls to boys in school is 3:5,how many boys are in 7th grade

Answer 1

Answer:

There are $300\ boys$ in 7th grade

Step-by-step explanation:

Let

x -----> the number of boys

y ----> the number of girls

we know that

$\frac{y}{x}=\frac{3}{5}$

$y=\frac{3}{5}x$ ----> equation A

$x+y=480$ -----> equation B

Substitute equation A in equation B and solve for x

$x+\frac{3}{5}x=480$

$\frac{8}{5}x=480$

$x=480*5/8$

$x=300\ boys$