Homework Help: math

Posted by Anonymous on Tuesday, January 22, 2013 at 2:15pm.

Sheila has a 12 gallon gas tank in her heavily packed van. On a recent trip she drove a total of 90 miles with the air-conditioner on the entire way. The gas gauge read exactly 3/4 of a tank at the start of the trip, and exactly 1/4 of a tank at the end of the trip. Assume the gas gauge is accurate. How many miles per gallon of gas did she get on this trip?

math - PsyDAG, Tuesday, January 22, 2013 at 6:06pm
3/4 -1/4 = 1/2

1/2 (12) = 6

90/6 = x/1

Solve for x.

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