If you burn 7 GPH for 3 hours, how many gallons are burned?

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Multiple Choice

If you burn 7 GPH for 3 hours, how many gallons are burned?

Explanation:
Rate times time gives the total quantity. If you burn 7 gallons per hour for 3 hours, multiply 7 by 3 to get 21 gallons. So the correct amount is 21 gallons. The other numbers would require different burn rates or times: 18 implies 6 GPH for 3 hours, 24 implies 8 GPH for 3 hours (or about 3.43 hours at 7 GPH), and 27 implies 9 GPH for 3 hours.

Rate times time gives the total quantity. If you burn 7 gallons per hour for 3 hours, multiply 7 by 3 to get 21 gallons. So the correct amount is 21 gallons. The other numbers would require different burn rates or times: 18 implies 6 GPH for 3 hours, 24 implies 8 GPH for 3 hours (or about 3.43 hours at 7 GPH), and 27 implies 9 GPH for 3 hours.

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