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13 April, 22:36

Charles finished 7 laps around the track. This is 20% of the number of laps he has to do. How many laps must he do?

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  1. 13 April, 23:50
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    To solve this problem, you have to use a proportion:

    7/20 = x/100

    After setting up the proportion, you have to cross multiply:

    20x=700

    Now, solve the equation by dividing by 20 on both sides:

    x=35

    So Charles has 35 laps left.
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