Basic info:
is means =
% means 1/100
of means *
let "what number" be x.
According to the info let's set the equation:
9 = 25% * x
9 = 25/100 * x
Multiply both sides by 100:
900 = 25x
Divide both sides by 25
900/25 = x
x = 36
So the unknown number is 36.
9 = 25% * 36
9 is 25% of 36
//Hope this helps
