SOLUTION: if 40% of x is 8, what is x % of 40? the answer is 10 But I am not sure why. Is their a formula 8/x =40/100

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Question 1165259: if 40% of x is 8, what is x % of 40? the answer is 10 But I am not sure why. Is their a formula
8/x =40/100
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
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if 40% of x is 8, what is x % of 40?
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0.4x=8
x=8%2F0.4
x=2%2F0.1
x=20
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%2820%2F100%29%2A40
%281%2F5%2940
8----------------- 20% of 40 is 8.