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A certain car averages 25 miles per gallon of gasline when

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A certain car averages 25 miles per gallon of gasline when [#permalink] New post 20 Oct 2006, 01:15
A certain car averages 25 miles per gallon of gasline 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

a. 28
b. 30
c. 33
d. 36
e. 38

OA is D. Can someone explain?
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Joined: 15 Jun 2006
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 [#permalink] New post 20 Oct 2006, 02:57
the car drives 10 miles in city and spends 0.5 gallon
then it drives 50 miles on highway and spends 1.25 gallon

in total it drives 60 miles and spents 1.65 gallons

60/1.65=36.363636... therefore D

(it's easier to divide 6000 by 165 =)
  [#permalink] 20 Oct 2006, 02:57
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A certain car averages 25 miles per gallon of gasline when

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