A certain truck uses 18 gallons of diesel fuel in traveling.

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BTGmoderatorLU: Moderator; Posts: 2505; Joined: Sun Oct 15, 2017 1:50 pm; Followed by:6 members

A certain truck uses 18 gallons of diesel fuel in traveling.

by BTGmoderatorLU » Thu Mar 01, 2018 11:01 am

A certain truck uses 18 gallons fuel in traveling 270 miles. In order for the truck to travel the same distance using 10 gallons of diesel fuel, by how many miles per gallon must the truck's fuel mileage be increased?

A. 8
B. 9
C. 12
D. 15
E. 27

The OA is C.

I'm really confused by this PS question. Experts, any suggestion about how can I solve it? Thanks in advance.

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Source: Beat The GMAT — Problem Solving | Thu Mar 01, 2018 11:01 am

DavidG@VeritasPrep: Legendary Member; Posts: 2663; Joined: Wed Jan 14, 2015 8:25 am; Location: Boston, MA; Thanked: 1153 times; Followed by:128 members; GMAT Score:770

by DavidG@VeritasPrep » Thu Mar 01, 2018 12:42 pm

LUANDATO wrote:A certain truck uses 18 gallons fuel in traveling 270 miles. In order for the truck to travel the same distance using 10 gallons of diesel fuel, by how many miles per gallon must the truck's fuel mileage be increased?

A. 8
B. 9
C. 12
D. 15
E. 27

The OA is C.

I'm really confused by this PS question. Experts, any suggestion about how can I solve it? Thanks in advance.

Initial miles per gallon = miles/gallon = 270/18 = 15

New miles per gallon that we aspire to = 270/10 = 27

So we need an increase of 27-15 = 12. The answer is C

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

by Scott@TargetTestPrep » Tue Mar 06, 2018 9:21 am

LUANDATO wrote:A certain truck uses 18 gallons fuel in traveling 270 miles. In order for the truck to travel the same distance using 10 gallons of diesel fuel, by how many miles per gallon must the truck's fuel mileage be increased?

A. 8
B. 9
C. 12
D. 15
E. 27

Currently the fuel mileage of the truck is 270/18 = 15 miles per gallon. If the truck were to use 10 gallons of fuel to travel 270 miles, then the fuel mileage would be 270/10 = 27 miles per gallon. Thus, the fuel mileage has to be increased by 27 - 15 = 12 miles per gallon.

Answer: C

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