"Percent" or "%" means "out of 100" or "per 100", Therefore 90% can be written as
90
100
.
When dealing with percents the word "of" means "times" or "to multiply".
Finally, lets call the number we are looking for "n".
Putting this altogether we can write this equation and solve for
n
while keeping the equation balanced:
n
=
90
100
×
120
n
=
10800
100
n
=
108
