book Maths Puzzle Numerical Ability

History has very little knowledge about Diafanto, a mathmatician of old. All that is known about him has been taken from his tombstone inscription which in the form of a mathmatic

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We have a race car fuel cell that is 16 inches tall, 34 inches deep, and 7 inches wide at the top and 17 inches wide at the bottom. How many gallons does this hold? 25-7*n=17