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

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Manager
Joined: 21 Feb 2012
Posts: 67
Concentration: Finance, General Management
GMAT 1: 600 Q49 V23
GPA: 3.8
WE: Information Technology (Computer Software)
A certain car can currently travel 17 miles per gallon of  [#permalink]

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10 May 2012, 04:18
3
5
00:00

Difficulty:

45% (medium)

Question Stats:

66% (01:30) correct 34% (01:31) wrong based on 228 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
Math Expert
Joined: 02 Sep 2009
Posts: 58445
A certain car can currently travel 17 miles per gallon of  [#permalink]

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10 May 2012, 04:29
2
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.

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Joined: 07 Sep 2013
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Concentration: Entrepreneurship
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Re: A certain car can currently travel 17 miles per gallon of  [#permalink]

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12 Sep 2013, 22:23
1
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

t1000
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Posts: 2509
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
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Re: A certain car can currently travel 17 miles per gallon of  [#permalink]

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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

D.
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Joined: 09 Sep 2013
Posts: 13278
Re: A certain car can currently travel 17 miles per gallon of  [#permalink]

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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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