Question #bf352

1 Answer
Vesco Santiago
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#

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