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timbo: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Fri Jul 17, 2009 4:55 am

by timbo » Fri Jul 17, 2009 4:58 am

A certain car uses 12 gallons of gasoline in traveling 240 miles. In order for the car to travel the same distance using 10 gallons of gasoline, by how many miles per gallon must the car's gas mileage be increased?

(A) 2 (B) 4 (C) 6 (D) 8 (E) 10

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Source: Beat The GMAT — Problem Solving | Fri Jul 17, 2009 4:58 am

struggling_guy2001: Senior | Next Rank: 100 Posts; Posts: 52; Joined: Tue Jan 27, 2009 9:44 am; Thanked: 4 times

by struggling_guy2001 » Fri Jul 17, 2009 5:31 am

A certain car uses 12 gallons of gasoline in traveling 240 miles.

==> mileage is (240/12) = 20 miles for gallon.

same distance using 10 gallons of gasoline

===> mileage shoud be (240/10) = 24 miles per gallon.

by how many miles per gallon must the car's gas mileage be increased?

Hence mileage should be increased by 4 miles per gallon.

Ans is B.

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8137; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Tue Dec 05, 2017 5:13 pm

timbo wrote:A certain car uses 12 gallons of gasoline in traveling 240 miles. In order for the car to travel the same distance using 10 gallons of gasoline, by how many miles per gallon must the car's gas mileage be increased?

(A) 2 (B) 4 (C) 6 (D) 8 (E) 10

We are given that a certain car uses 12 gallons of gasoline in traveling 240 miles.

Since rate = distance/gallons used, the rate of the car, in miles per gallon, is 240/12 = 20 mpg.
If the car were to travel the same distance using 10 gallons of gasoline, the rate, in miles per gallon, would be 240/10 = 24.

Thus, the new rate is 4 mpg more than that of the old rate.

Answer: B

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