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

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Senior Manager
Joined: 23 May 2005
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Location: Sing/ HK
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A certain car averages 25miles per gallon of gasoline when [#permalink]  30 Nov 2006, 08:41
A certain car averages 25miles 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
_________________

Impossible is nothing

Manager
Joined: 01 Feb 2006
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Location: New York
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10/25 + 50/40 galons total for 60 miles

= 33/20

Hence, avg mpg = 60*20/33 ~ 36

Ans: 36.

OA?
Manager
Joined: 17 Dec 2004
Posts: 73
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I get E.

A car averaging 25 mpg uses 0.4 gallons to drive 10 miles. A car averaging 40 mpg uses 1.2 gallons to drive 50 miles.

Average mpg = (total miles)/(gallons of gasoline) = (60 miles)/(1.6 gallons)

Dividing, we get average mpg = 37.5 ~ 38.

What is OA?
Senior Manager
Joined: 08 Jun 2006
Posts: 343
Location: Washington DC
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I got 36.36363636363636.....without rounding
Director
Joined: 01 Oct 2006
Posts: 500
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halahpeno wrote:
I get E.

A car averaging 25 mpg uses 0.4 gallons to drive 10 miles. A car averaging 40 mpg uses 1.2 gallons to drive 50 miles.

Average mpg = (total miles)/(gallons of gasoline) = (60 miles)/(1.6 gallons)

Dividing, we get average mpg = 37.5 ~ 38.

What is OA?

1.2 gallons for 50 miles is incorrect it must 1.25 gallons
Manager
Joined: 17 Dec 2004
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Um. Duh. Good call. Perhaps I shouldn't take the test on Saturday - I'm burning out!
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