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

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VP
Joined: 30 Jun 2008
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A certain car averages 25 miles per gallon of gasoline when [#permalink]  07 Oct 2008, 19:57
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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 then 50 miles on the highway?

- 28
- 30
- 33
- 36
- 38
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Senior Manager
Joined: 28 Feb 2007
Posts: 306
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Kudos [?]: 32 [0], given: 0

Re: PS : GMAT PREP [#permalink]  07 Oct 2008, 20:34
D.
for 10 miles (city) car uses 10/25=0.4 gallon
for 50 miles (highway) it uses 50/40= 1.25 gallon
total used gas= 1.65
total distance traveled= 10+50=60
60/1.65=36
VP
Joined: 30 Jun 2008
Posts: 1048
Followers: 11

Kudos [?]: 348 [0], given: 1

Re: PS : GMAT PREP [#permalink]  07 Oct 2008, 20:37
UMB wrote:
D.
for 10 miles (city) car uses 10/25=0.4 gallon
for 50 miles (highway) it uses 50/40= 1.25 gallon
total used gas= 1.65
total distance traveled= 10+50=60
60/1.65=36

D is the right answer ......

I thought this one was a weighted average problem !!
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Re: PS : GMAT PREP   [#permalink] 07 Oct 2008, 20:37
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