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

There are
`300\ boys` in 7th grade

Explanation:

Let

x -----> the number of boys

y ----> the number of girls

we know that

`(y)/(x)=(3)/(5)`

`y=(3)/(5)x` ----> equation A

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

Substitute equation A in equation B and solve for x

`x+(3)/(5)x=480`

`(8)/(5)x=480`

`x=480*5/8`

`x=300\ boys`