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tank full of gasoline on the highway

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by sanju09 » Thu Jan 14, 2010 2:10 am
A car traveled 462 miles per tank full of gasoline on the highway and 336 miles per tank full of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?
(A) 14
(B) 16
(C) 18
(D) 21
(E) 22
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by papul » Thu Jan 14, 2010 3:01 pm
Let 'T' be the tank gallon capacity

Per Galon mile on Highway = 462/T
Per Galon mile in City = 336/T

citymiles/gallon is 6 less that highwaymiles/gallon
(464/T) - (336/T) = 6
T = 21 gallons

Thus
Per Galon mile in City = 336/T = 336/21 = 16.
Answer is B
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