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by parulmahajan89 » Sun Dec 01, 2013 8:22 pm
At a speed of 50 miles/hr, a certain car uses 1 gallon of gasoline every 30 miles.If the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles/hour, the amount of gasoline used would be what fraction of full tank?

a)3/25
b) 11/36
c) 7/12
d) 2/3
e) 25/36

The answer is E not sure if my explanation is correct.
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by Matt@VeritasPrep » Sun Dec 01, 2013 9:14 pm
Distance = Rate * Time = 50 * 5 = 250

So the car travels 250 miles.

Gallons of Gas Used = Distance/Rate = 250/30 = 25/3

So the car uses 25/3 gallons of gas.

If the full tank is 12 gallons, our ratio of Used : Total = (25/3) / 12 = (25/3) / (36/3) = 25/36, and we're done!
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