Answer:
\(15\ girls\)
Step-by-step explanation:
Let
x-----> the number of girls
y-----> the number of boys
we know that
\(x+y=27\) -----> equation A
\(\frac{x}{y}=\frac{5}{4}\)
isolate the variable y
\(y=\frac{4}{5}x\) -----> equation B
Substitute equation B in equation A
\(x+\frac{4}{5}x=27\)
\(\frac{9}{5}x=27\)
\(x=5*27/9=15\ girls\)
