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 Post subject: Rate
PostPosted: Wed Jan 20, 2010 9:23 pm 
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Joined: Wed Jan 20, 2010 9:18 pm
Posts: 1
Two hundred gallons of fuel oil are purchased at 0.91$ per gallon and are consumed at a rate of 0.7$ worth of fuel per hour. At this rate, how many hours are required to consume the 2000 gallons of fuel oil?

A 140
B) 220
C) 260
D)322
E) 330

Hi! need some help!!!


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 Post subject: Re: Rate
PostPosted: Fri Apr 16, 2010 1:18 pm 
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Joined: Fri Apr 09, 2010 2:11 pm
Posts: 454
The clue for solving this problem is to convert $/hour consumption to gallons/hour.

If 1 gallon of fuel costs $0.91 and consumption rate is $0.7/hour then consumption rate in gallons equals to (0.7 / 0.91) gallons/hour

So 200 gallons will be consumed in 200/(0.7 / 0.91) = 260 hours.


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