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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 -

    3/4 -1/4 = 1/2

    1/2 (12) = 6

    90/6 = x/1

    Solve for x.

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