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A certain car averages 25 miles per gallon when driving in

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Re: A certain car averages 25 miles per gallon when driving in [#permalink]

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New post 29 May 2017, 02:22
leafsrule99 wrote:
A certain car averages 25 miles per gallon when driving in the city and 40 miles per gallon when driving 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

1. Since mileage is varying according to city or highway, average is calculated by total miles traveled / total gallons used
2. Total miles traveled=60
3. total gallons used = gallons used in city + gallons used in highway= 10/25 + 50/40= 33/20
4. So average is 60/(33/20)=36(approx)
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Re: A certain car averages 25 miles per gallon when driving in [#permalink]

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New post 25 Jun 2017, 11:42
leafsrule99 wrote:
A certain car averages 25 miles per gallon when driving in the city and 40 miles per gallon when driving 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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Re: A certain car averages 25 miles per gallon when driving in [#permalink]

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New post 24 Jan 2018, 19:52
Bunuel

Can this question be solved by Alligation?
Re: A certain car averages 25 miles per gallon when driving in   [#permalink] 24 Jan 2018, 19:52

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