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# a certain car averages 25 miles per gallon of gasoline when

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Joined: 17 Jul 2006
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a certain car averages 25 miles per gallon of gasoline when [#permalink]

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11 Sep 2006, 14:28
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

a certain car averages 25 miles per gallon of gasoline when driven in the city and 40 miles per gallon when driven on the highway. according to these rates, which of the following is closest to the number of miles per gallon that the car averages when it is driven 10 miles in the city and 50 miles on the highway?

28
30
33
36
38
VP
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11 Sep 2006, 14:40
D. 36

City mileage : 25 mpg
Hwy mileage: 40 mpg

Avg Mileage = Total Dist/total Gas

Total Distance = 10 + 50 = 60

Total Gas = 10/25+50/40 = 330/200

Avg Mileage = 60x200/330 = 36.6
Approx. 36
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11 Sep 2006, 16:40
Haas is correct, 36 it is.

City: X
Higway Y

Efficency:
X: 25mpg --> so 10 miles will consume 10/25g = 2/5g
Y: 40mpg --> so 50 miles will consume 50/40g = 5/4g

Average: 60/(2/5+5/4) = 1200/33 = 400/11 = 36.xxx
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Re: gmat prep --- miles per gallon question [#permalink]

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11 Sep 2006, 17:21
cejismundo wrote:
a certain car averages 25 miles per gallon of gasoline when driven in the city and 40 miles per gallon when driven on the highway. according to these rates, which of the following is closest to the number of miles per gallon that the car averages when it is driven 10 miles in the city and 50 miles on the highway?

28
30
33
36
38

hehe it took me several minutes to get this one right.. and i use this almost everyday at the pump
VP
Joined: 02 Jun 2006
Posts: 1261
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Re: gmat prep --- miles per gallon question [#permalink]

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11 Sep 2006, 17:25
One lesson I have learnt is that for PS questions which are long on the GMAT... read very very slowly. Its ok to take 30seconds more to read, but read it carefully.

I myself need to learn that lesson well...

Nsentra wrote:
cejismundo wrote:
a certain car averages 25 miles per gallon of gasoline when driven in the city and 40 miles per gallon when driven on the highway. according to these rates, which of the following is closest to the number of miles per gallon that the car averages when it is driven 10 miles in the city and 50 miles on the highway?

28
30
33
36
38

hehe it took me several minutes to get this one right.. and i use this almost everyday at the pump
Re: gmat prep --- miles per gallon question   [#permalink] 11 Sep 2006, 17:25
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