Verified Answer :

FuzzieBuzzie

The answer to you problem is 16.2, the equation you needed was, 90/0.18

90/x=100/18
(90/x)x=(100/18)x       -  multiply both sides of the equation by x
90=5.55555555556*x       - divide both sides of the equation by (5.55555555556) to get x
90/5.55555555556=x 
16.2=x 
x=16.2
18% of 90=16.2

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