Question

The enrollment in a school this year is 552 . This is an increase of 15% over last years enrollment . How many were enrolled last years?

Answer 1

Let enrollment last year $=x$

This year $=x+15$% of $x$

$=x+\frac{15}{100}x$

$=\frac{115x}{100}$

Given this year enrollment $=552$

$\therefore$ $\frac{115x}{100}=552$

$x=480$