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Stumped with this math problem [#permalink]
04 Oct 2009, 21:04

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

100% (00:00) correct
0% (00:00) wrong based on 1 sessions

Hello, if anyone could help me figure out this problem I would very much appreciate it.

I treated it as a weighted average problem and got an answer of 37.5 which I rounded to 38, but that was clearly the wrong approach seeing as how the answer is 36.

Re: Stumped with this math problem [#permalink]
05 Oct 2009, 08:08

Fuel used in the City trip = A =10/25 gal Fuel used in the Highway trip = B = 50/40 gal Total distance traveled = C = 60 miles Total gasoline used = A+B = 33/20 Avg mpg = C/ (A+B) = 60*20/33 = 36.36 = 36 rounded off.

Re: Stumped with this math problem [#permalink]
05 Oct 2009, 08:12

Blayze as a rule of thumb, when you calculate averages never work with composites such as speed, momentum, density etc, always work with the basics such as distance, time, mass, volume and so on. Hope this helps resolve the mistake you made. _________________

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