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
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$\displaystyle 4:5 \Rightarrow x:x+5$ Therefore $\displaystyle \frac{x}{4}=\frac{x+5}{5}$ $\displaystyle 5x = 4(x+5)$ $\displaystyle 5x = 4x+20$ can you solve it form here?
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