Question

The ratio of girls to boys in Liza’s classroom is 5

Answer 1

Answer:

15 girls

Step-by-step explanation:

Let

x ----> the number of girls in Liza's classroom

y ----> the number of boys in Liza's classroom

we know that

$\frac{x}{y}=\frac{5}{4}$  

$x=\frac{5}{4}y$ -----> equation A

$x+y=27$ ----> equation B

solve the system by substitution

substitute equation A in equation B

$\frac{5}{4}y+y=27$

solve for y

$\frac{9}{4}y=27$

$y=27(4)/9\\\\y=12\ boys$

Find the value of x

$x=\frac{5}{4}(12)=15\ girls$