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

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SVP
Joined: 31 Jul 2006
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A certain car averages 25 miles per gallon of gasoline when [#permalink]

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06 Aug 2006, 19:46
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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

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Director
Joined: 04 Jan 2006
Posts: 922

Kudos [?]: 38 [0], given: 0

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06 Aug 2006, 20:01
36....

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

~~ 36

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VP
Joined: 02 Jun 2006
Posts: 1257

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07 Aug 2006, 08:24
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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Intern
Joined: 26 Apr 2006
Posts: 44

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07 Aug 2006, 09:31
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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Director
Joined: 17 Jul 2006
Posts: 700

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07 Aug 2006, 12:46
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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CEO
Joined: 20 Nov 2005
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Schools: Completed at SAID BUSINESS SCHOOL, OXFORD - Class of 2008

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07 Aug 2006, 13:39
Total fuel consumed = 10/25 + 50/40 = 33/20
Total miles driven = 60

Average = 60/(33/20) = 1200/33 = 36 approx.
_________________

SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008

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Director
Joined: 13 Nov 2003
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Location: BULGARIA

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08 Aug 2006, 03:59
Think it is like that
(10/60)*25+(50/60)*40=2250/60=37,5 mpg
Seems like E to me

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08 Aug 2006, 03:59
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