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A certain car can currently travel 17 miles per gallon of

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A certain car can currently travel 17 miles per gallon of [#permalink]

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New post 10 May 2012, 04:18
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Question Stats:

64% (01:03) correct 36% (01:02) wrong based on 200 sessions

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A certain car can currently travel 17 miles per gallon of gasoline. After a tune up, the car will use 80 percent as much gasoline as it does now. How many miles will the car be able to travel per gallon of gasoline after the tune up?

A. 13.6
B. 15
C. 20.4
D. 21.25
E. 23.5
[Reveal] Spoiler: OA
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A certain car can currently travel 17 miles per gallon of [#permalink]

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New post 10 May 2012, 04:29
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piyushksharma wrote:
A certain car can currently travel 17 miles per gallon of gasoline. After a tune up, the car will use 80 percent as much gasoline as it does now. How many miles will the car be able to travel per gallon of gasoline after the tune up?

A. 13.6
B. 15
C. 20.4
D. 21.25
E. 23.5


Currently: 1 gallon = 17 miles;
After the tune up: 0.8 gallons = 17 miles --> 1 gallon = 17/0.8 = 17*5/4 = 21.25 miles.

Answer: D.
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Re: A certain car can currently travel 17 miles per gallon of [#permalink]

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New post 12 Sep 2013, 22:23
We're told 17 miles per 1 gallon

After the tuneup we can get 17 miles per .8 gallons

So, if 17 miles = .8 gallons
Then 170 miles = 8 gallons

170/8 = 1 gallon

170/8 = 85/4 = 21.25

Choice D

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Re: A certain car can currently travel 17 miles per gallon of [#permalink]

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New post 06 Feb 2016, 10:23
oh man..after a break...even such problems make me think whether I am dumb or not...
i used a chart to solve it:

Rate | Gallons | Distance
17/1 | 1 | 17
17/0.8 | 0.8 | 17

17* 10/8 = 170/8 = 21.25

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Re: A certain car can currently travel 17 miles per gallon of [#permalink]

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New post 13 Mar 2018, 10:38
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Re: A certain car can currently travel 17 miles per gallon of   [#permalink] 13 Mar 2018, 10:38
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