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divya23: Master | Next Rank: 500 Posts; Posts: 113; Joined: Mon Apr 26, 2010 8:58 am; Thanked: 2 times; Followed by:14 members

gallons

by divya23 » Mon Jun 06, 2011 10:27 am

at a speed of 50mph a ceratin car uses 1 gallon gasoline every 30 miles.if car starts with full 12 gallons gasoline and travels 5hrs at 50mph amount of gas used would be wat fraction of full tank
[spoiler]
ans = 25/36[/spoiler]

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Source: Beat The GMAT — Problem Solving | Mon Jun 06, 2011 10:27 am

Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 am; Location: India; Thanked: 375 times; Followed by:53 members

by Frankenstein » Mon Jun 06, 2011 10:33 am

Hi,
Car travels for 5 hrs @50mph. so distance covered= 50*5=250 miles.
Gallons of gasoline used = 250/30 = 25/3.
So, fraction is (25/3)/12 = 25/36.

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champ0007: Senior | Next Rank: 100 Posts; Posts: 43; Joined: Wed Feb 06, 2008 5:37 am; Thanked: 8 times; Followed by:1 members

by champ0007 » Mon Jun 06, 2011 10:35 am

1 Gallon is used for 30 miles

Distance Travelled in 5 hrs = 5 * 50 = 250 miles.

Gas used = 250/30 = 25/3

Fraction (25/3)/12 = 25/36

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cans: Legendary Member; Posts: 1309; Joined: Mon Apr 04, 2011 5:34 am; Location: India; Thanked: 310 times; Followed by:123 members; GMAT Score:750

by cans » Mon Jun 06, 2011 4:42 pm

50mph.
for 30 miles, i gallon used.
time taken to travel 30 miles = 3/5 hours
thus every 3/5 hours, 1 gallon is used.
travels 5 hours, gallons used = (5/3)*5 = 25/3

fraction of full tank = 25/(3*12)=25/36

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