parulmahajan89 wrote: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
Distance:
At a rate of 50 miles per hour, the distance traveled in 5 hours = r*t = 50*5 = 250 miles.
Gas usage for 250 miles:
(1 gallon)/(30 miles) = (x gallons)/(250 miles)
30x = 250
x = 250/30 = 25/3 gallons.
Resulting fraction:
(gas usage)/(full tank) = (25/3)/12 = 25/36.
The correct answer is
E.
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