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A certain car averages 25 miles per gallon of gasoline when

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SVP
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A certain car averages 25 miles per gallon of gasoline when [#permalink] New post 06 Aug 2006, 18:46
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A
B
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D
E

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A certain car averages 25 miles 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?

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

I think I'm going nuts. Please help.
Director
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 [#permalink] New post 06 Aug 2006, 19:01
36....

(50+10)
-------------------
(10/25 + 50/40)

~~ 36
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 [#permalink] New post 07 Aug 2006, 07:24
d. 36

Number of gallons used = 10/25 + 50/40 = 33/20 gallons

Avg mpg = Miles/Gallons Used
= 60x20/33 = 400/11 ~ 36
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 [#permalink] New post 07 Aug 2006, 08:31
Nope i think 10*25 + 50*40/10+50

= 2250/60 = 37.5 rounded to 38 is the final answer i.e. E
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 [#permalink] New post 07 Aug 2006, 11:46
25 and 40 are in the ratio 5 : 8

( 10 * 5 + 50 * 8 ) / 5 + 8

450/13 = 35(close to 35)

Ans 36
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 [#permalink] New post 07 Aug 2006, 12:39
Total fuel consumed = 10/25 + 50/40 = 33/20
Total miles driven = 60

Average = 60/(33/20) = 1200/33 = 36 approx.
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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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 [#permalink] New post 08 Aug 2006, 02:59
Think it is like that
(10/60)*25+(50/60)*40=2250/60=37,5 mpg
Seems like E to me
  [#permalink] 08 Aug 2006, 02:59
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