To calculate 7 gallons 1 quart multiplied by 9, first convert the quarts to gallons by dividing 1 quart by 4 (since there are 4 quarts in a gallon), which equals 0.25 gallons. Then, add this to the 7 gallons to get a total of 7.25 gallons. Finally, multiply 7.25 gallons by 9 to get the final answer, which is 65.25 gallons.
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