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A certain car averages 25 miles per gallon when driven in

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A certain car averages 25 miles per gallon when driven in [#permalink] New post 05 Aug 2006, 14:41
A certain car averages 25 miles per gallon when driven in the city and 40 miles per gallon when driven on highway. according to these rates, which of the following is closest to the number of miles per gallon 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
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 [#permalink] New post 05 Aug 2006, 14:49
D 36

25 mpg in city => 10 miles used 10/25 i.e. 0.4 gallons
40mpg highway => 50 miles used 50/40 i.e. 1.25gallons

Average mpg = Distance/Total fuel used = 60/1.65 = 36.36
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 [#permalink] New post 06 Aug 2006, 18:58
No i think 10* 25 + 50_40 / 10 + 50

Thus 2250/60 = 225/6 = 37.5 Approx 38

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 [#permalink] New post 06 Aug 2006, 19:21
(D) 36 (To be more precise, 36.363636 mpg)

Total gallons use for 60 mile trip:

10/25 + 50/40 = ... = 33/20 gallons

MPG: 60 miles / (33/20) gallons = 1200/33 = 36.363636
  [#permalink] 06 Aug 2006, 19:21
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