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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22-01-2016
Mathematics

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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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tpp034 tpp034 · Answer 1 · 2016-01-22T00:31:22+01:00

tpp034 tpp034

22-01-2016

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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