SOLUTION: david is taking a long car trip. his gas tank holds about 16 gallons. he fills up at the beginning of the trip. he looks down at the dashboard after a while, and notices the tank i

Question 166076: david is taking a long car trip. his gas tank holds about 16 gallons. he fills up at the beginning of the trip. he looks down at the dashboard after a while, and notices the tank is now around 3/4 full, and he has gone about 70 miles.
a)how far could he go on a full tank
b)his total trip is about 500 miles. how much gas will he use?
Answer by gonzo(654) (Show Source): You can put this solution on YOUR website!
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.
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