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girishbtg: Senior | Next Rank: 100 Posts; Posts: 78; Joined: Mon Sep 20, 2010 12:51 am

by girishbtg » Fri Oct 01, 2010 4:44 am

Acc to me ->

(25*10 + 50*40) / (10 +50) = 37.5 i.e. 38 i.r. E is ans

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Source: Beat The GMAT — Problem Solving | Fri Oct 01, 2010 4:44 am

goyalsau: Legendary Member; Posts: 866; Joined: Mon Aug 02, 2010 6:46 pm; Location: Gwalior, India; Thanked: 31 times

by goyalsau » Fri Oct 01, 2010 4:49 am

IS it 36.

According to me
it takes .40 gallon of gas to drive 10 miles
and 1.25 gallon to gas to drive 50 miles

in all 1.65 gallon of gas to drive 60 miles

then 60/1.65 = 36.36

Last edited by goyalsau on Fri Oct 01, 2010 4:54 am, edited 1 time in total.

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shovan85: Community Manager; Posts: 991; Joined: Thu Sep 23, 2010 6:19 amFollowed by: 24 members; Location: Bangalore, India; Thanked: 146 times

by shovan85 » Fri Oct 01, 2010 4:51 am

IMO [spoiler]D: 36[/spoiler]

We just cannot take the average. Need to find out how much gasoline spent for total journey and divide the total distance by total gasoline spent.

Total journey is 60miles
Total gasoline = 10/25 + 50/40 = 1.65 gallon.

Divide 60 by 1.65 and thus [spoiler]D: 36[/spoiler] is the nearest answer.

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