If a 171 mile trip took 9 1/2 gallons of gas, how many miles can be driven with a full tank of 18 gallons?
171/9.5= 18 miles per gallon of gas, thus, ratio would be 18/1
18/1 x 18 = 324/18 ,thus,
18 gallons of gas will travel 324 miles
(18/1 = 324/18
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