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Stumped with this math problem (part 2)

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Manager
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Joined: 28 Mar 2009
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Stumped with this math problem (part 2) [#permalink] New post 04 Oct 2009, 20:57
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

100% (00:00) correct 0% (00:00) wrong based on 1 sessions
Sorry to bug you guys, I've got my test tomorrow and was hoping to figure this one out as I was almost certain I had the right answer but apparently I missed something.

I treated this as a weighted average question and got to 27.5 and rounded to 28, but gmat prep claims the answer is 26.

Thanks!
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Re: Stumped with this math problem (part 2) [#permalink] New post 04 Oct 2009, 21:02
Expert's post
You should post these in the Math Forum (DS or PS)
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Re: Stumped with this math problem (part 2) [#permalink] New post 04 Oct 2009, 21:06
In city driving = 10 miles, gas used = 10/25 gallons
On highway driving = 50 miles, gas used = 50/40 gallons

Avg. miles per gallon = (10+50)/(10/25+50/40) = 60/1.65 = 36.36

So nearest possible answer = 36
Re: Stumped with this math problem (part 2)   [#permalink] 04 Oct 2009, 21:06
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Stumped with this math problem (part 2)

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