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If an automobile averaged 22.5 miles per gallon of gasoline

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If an automobile averaged 22.5 miles per gallon of gasoline  [#permalink]

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New post Updated on: 30 Oct 2012, 08:56
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If an automobile averaged 22.5 miles per gallon of gasoline, approximately how many kilometers per liter of gasoline did the automobile average? (1 mile = 1.6 kilometers and 1 gallon = 3.8 liters, both rounded to the nearest tenth.)

A. 3.7
B. 9.5
C. 31.4
D. 53.4
E. 136.8

Originally posted by alltimeacheiver on 11 Feb 2011, 02:27.
Last edited by Bunuel on 30 Oct 2012, 08:56, edited 1 time in total.
Renamed the topic and edited the question.
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Re: rate problem undersatnding  [#permalink]

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New post 11 Feb 2011, 03:30
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alltimeacheiver wrote:
If an automobile averaged 22.5 miles per gallon of gasoline, approximately how many
kilometers per liter of gasoline did the automobile average? (1 mile = 1.6 kilometers and
1 gallon = 3.8 liters, both rounded to the nearest tenth.)
A. 3.7
B. 9.5
C. 31.4
D. 53.4
E. 136.8


\(average=\frac{22.5 \ miles}{1 \ gallon}=\frac{22.5*1.6 \ kilometers}{3.8 \ liters}=\frac{36}{3.8}\approx{9.5}\) (22.5*1.6 is ~40 and 3.8 is ~4 so the result must be ~10).

Answer: B.
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Re: rate problem undersatnding  [#permalink]

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New post 11 Feb 2011, 14:09
2
alltimeacheiver wrote:
If an automobile averaged 22.5 miles per gallon of gasoline, approximately how many
kilometers per liter of gasoline did the automobile average? (1 mile = 1.6 kilometers and
1 gallon = 3.8 liters, both rounded to the nearest tenth.)
A. 3.7
B. 9.5
C. 31.4
D. 53.4
E. 136.8


If you have problems in questions with multiple units, check out this post:
http://www.veritasprep.com/blog/2011/01/quarter-wit-quarter-wisdom-of-pounds-and-ounces/
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Re: rate problem undersatnding  [#permalink]

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New post 12 Feb 2011, 10:50
Thanks for the question.
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Re: If an automobile averaged 22.5 miles per gallon of gasoline  [#permalink]

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New post 27 Feb 2018, 09:33
alltimeacheiver wrote:
If an automobile averaged 22.5 miles per gallon of gasoline, approximately how many kilometers per liter of gasoline did the automobile average? (1 mile = 1.6 kilometers and 1 gallon = 3.8 liters, both rounded to the nearest tenth.)

A. 3.7
B. 9.5
C. 31.4
D. 53.4
E. 136.8


22.5 miles is 22.5 x 1.6 = 36 km.

1 gallon is 3.8 liters.

So the approximate rate, in km/liter, is 36/3.8 = 9.473.

Answer: B
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Re: If an automobile averaged 22.5 miles per gallon of gasoline &nbs [#permalink] 27 Feb 2018, 09:33
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