math
posted by Anonymous .
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 airconditioner 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?

3/4 1/4 = 1/2
1/2 (12) = 6
90/6 = x/1
Solve for x.
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