Question 166076
1 tank = 16 gallons
70 miles uses up 1/4 tank
full tank will take him 4 times as far = 280 miles.
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since a full tank is 16 gallons, and he can go 280 miles, then he gets 280 / 16 gallons = 17.5 miles per gallon.
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to travel 500 miles at 17.5 miles per gallon, he will use 500 / 17.5 = 28.57142857 gallons of gas.
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28.57142857 gallons / 16 gallons tank capacity = 1.785714286 tanks worth of gas.