Question #bf352

1 Answer
Jan 18, 2018

50

Explanation:

We're looking for number x, where 90% of x is 45. Thus we can make this equation:

x90%=45

aka

x910=45

If we multiply the entire equation by 10 and then divide everything by 9 (or multiply everything by 109), we can isolate x on the left side and find its value:

x910109=45109

x=4509=50

So, 90% of 50 is 45