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A certain car averages 25miles per gallon of gasoline when

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Senior Manager
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A certain car averages 25miles per gallon of gasoline when [#permalink] New post 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
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 [#permalink] New post 30 Nov 2006, 09:23
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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 [#permalink] New post 30 Nov 2006, 09:33
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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 [#permalink] New post 30 Nov 2006, 09:35
I got 36.36363636363636.....without rounding :lol:
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 [#permalink] New post 30 Nov 2006, 10:56
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
Answer is 36
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 [#permalink] New post 30 Nov 2006, 13:22
Um. Duh. Good call. Perhaps I shouldn't take the test on Saturday - I'm burning out!
  [#permalink] 30 Nov 2006, 13:22
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