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posted by losted Thursday, February 21, 2008 at 9:18pm.
the gas tank of your car holds 21 gallons. It is 1/3 full. How many gallons will it take to fill the tank?
1/3 * 21 = 7 You have 7 gallons. Subtract 7 from 21 to find the number of gallons you need to add.
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