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12 March, 16:08

18% of what number is 43?

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  1. 12 March, 16:52
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    1. We assume, that the number 43 is 100% - because it's the output value of the task. Also that x is the value that we are looking for.

    So you write down 100%=43

    Next x% equals 18 of the output value.

    so you write it down as x%=18

    Now we have two simple equations:

    Which is 100%=43 and x%=18

    where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

    100%/x%=43/18

    Now we just have to solve the simple equation.

    Solution for 18 is what percent of 43?

    (100/x) * x = (43/18) * x - we multiply both sides of the equation by x

    100=2.38888888889*x - we divide both sides of the equation by (2.38888888889) to get x

    100/2.38888888889=x

    41.86=x

    x=41.86

    now we have:

    18 is 41.86% of 43
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