A certain car averages 25 miles per gallon of gasoline when : GMAT Problem Solving (PS)
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# A certain car averages 25 miles per gallon of gasoline when

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

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15 Jul 2008, 09:12
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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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15 Jul 2008, 09:33
Total distance = 60 miles
City = 10 miles or 1/6
Highway = 50 miles or 5/6

Weighted average: (25 * 1/6) + (40 * 5/6) = 225/6 = 37,5

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15 Jul 2008, 09:36

10/25 + 50/40 = 33/20 gallons for entire trip

so trips lasts 60 miles

60 * 20/33 = 36.36
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15 Jul 2008, 09:38
The car uses 1/25 gallon per mile in the city and 1/40 gallon per mile on a highway

Therefore, during the 60 miles (10 in the city, 50 on a highway) that it has to travel it would use:

10*1/25 + 50*1/40 = 33/20 gallons for the 60 miles i.e. 33/(20*60) gallons per mile on average

==> consumption = 1200/33 miles per gallon, which is close to 36

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Re: A certain car averages 25 miles per gallon of gasoline when [#permalink]

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30 Nov 2011, 21:38
1/25*10 = 0.4
1/40*50 = 1.25

Total gasoline = 0.4+ 1.25 = 1.65

Average for 60 (10+50) = 60/1.65= 36.3........
Ans. D
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Re: A certain car averages 25 miles per gallon of gasoline when [#permalink]

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01 Dec 2011, 04:22
Total Dist=10+50=60
Total Time = 10/25+50/40=33/20
Speed = D/t = 60x20/33=36.3...

Ans==>D
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Re: A certain car averages 25 miles per gallon of gasoline when [#permalink]

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08 Dec 2011, 01:52
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City = 10 miles or 1/6(25mpg)
Highway = 50 miles or 5/6(40mpg)

Average Mileage: (25 * 1/6) + (40 * 5/6) = 225/6 = 37.5
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Re: A certain car averages 25 miles per gallon of gasoline when [#permalink]

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12 Dec 2011, 23:09
OA is E
Total distance traveled = 60 miles
City = 10 miles or 1/6
Highway = 50 miles or 5/6

Weighted average: (25 * 1/6) + (40 * 5/6) = 225/6 = 37.5 miles per gallon
Re: A certain car averages 25 miles per gallon of gasoline when   [#permalink] 12 Dec 2011, 23:09
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