Question

The ratio of girls to boys in Liza’s classroom is 5 to 4. How many girls are in her classroom if there is a total of 27 students

Answer 1

`15\ girls`

Explanation:

Let

x-----> the number of girls

y-----> the number of boys

we know that

`x+y=27` -----> equation A

`(x)/(y)=(5)/(4)`

isolate the variable y

`y=(4)/(5)x` -----> equation B

Substitute equation B in equation A

`x+(4)/(5)x=27`

`(9)/(5)x=27`

`x=5*27/9=15\ girls`