# Math Help - ratio word problem

1. ## ratio word problem

The ratio of girs to boys in Sat class is 4 : 5. lf there are 5 more boys than girls,which of the following is the number of students in this class?

(A) 9 (B) 18 (c) 45 (D) 90 (E) 180

2. $4:5 \Rightarrow x:x+5$

Therefore

$\frac{x}{4}=\frac{x+5}{5}$

$5x = 4(x+5)$

$5x = 4x+20$

can you solve it form here?