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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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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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Jan 14, 2017
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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?
Mathematics
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Mobob
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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.
Brad Zeis
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Jan 20, 2017
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