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A certain car averages 25miles per gallon of gasoline when

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

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30 Nov 2006, 09:41
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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
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Impossible is nothing

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30 Nov 2006, 10:23
10/25 + 50/40 galons total for 60 miles

= 33/20

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

Ans: 36.

OA?
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30 Nov 2006, 10:33
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?
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30 Nov 2006, 10:35
I got 36.36363636363636.....without rounding
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30 Nov 2006, 11:56
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
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30 Nov 2006, 14:22
Um. Duh. Good call. Perhaps I shouldn't take the test on Saturday - I'm burning out!
30 Nov 2006, 14:22
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