The Ricco family filled the gasoline tank of their car at the

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The Ricco family filled the gasoline tank of their car at the beginning of a long trip. Their car used gasoline at the rate of 1 gallon every 21 miles. When they stopped for lunch, they had driven 315 miles, and there were 9 gallons of gasoline left in the tank. How many gallons does the gasoline tank hold?

2 answers

x - 315/21 = 9

Solve for x.

24 gallons

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