Question

18 is 240% of what? basic percent equation ...?

Answer 1

18 = (240/100) x what;
what = 18 x (100/240);
what = 1800/240;
what = 7.5;

Answer 2

Set up an equation: 18=240%•X. Get the unknown by itself: 18/2.4=X. 7.5=X. 18 is 240% of 7.5 :)