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:

x * 90% = 45

aka

x*9/10=45

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

x*9/10 *10/9=45*10/9

x = 450/9 = 50

So, 90% of 50 is 45