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rates gmat prep ques

This topic has 4 member replies
yvonne12 Master | Next Rank: 500 Posts Default Avatar
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rates gmat prep ques

Post Sun Mar 04, 2007 12:31 pm
at a speed of 50mph a certain car uses 1 gallon of gasoline every 30 miles. if the car starts with a full tank of 12 gallon tank of gasoline and travels for 5 hours at 50 mph the amount of gas used would be what fraction of a full tank??

ans. 25/36

please explain

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yvonne12 Master | Next Rank: 500 Posts Default Avatar
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Post Mon Mar 05, 2007 5:03 pm
thanks again for making it clear for me. I understand now.

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ssiva Junior | Next Rank: 30 Posts Default Avatar
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Post Mon Mar 05, 2007 10:35 am
The problem asks "the amount of gas used would be what fraction of a full tank??"

You have to find the fraction here:
Numerator = to be calculated
Denominator = 12 ( full tank of gas )


As jayhawlk mentions: one has to find out how much gallons is used for 5 hours.

From the problem
1 gallon = 30 miles @ 50 miles per hour
So to travel 50 miles in one hour, car consumes 50/30 = 5/3 gallons.

We need to find out what is the consumption for 5 hours = 5 * consumtioon for 1 hours = 5 * (50/30) = 25/3

So the final solution is (25/3)/12 = 25/36

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yvonne12 Master | Next Rank: 500 Posts Default Avatar
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Posted:
144 messages
Post Mon Mar 05, 2007 5:03 pm
thanks again for making it clear for me. I understand now.

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ssiva Junior | Next Rank: 30 Posts Default Avatar
Joined
13 Feb 2007
Posted:
16 messages
Upvotes:
1
Post Mon Mar 05, 2007 10:35 am
The problem asks "the amount of gas used would be what fraction of a full tank??"

You have to find the fraction here:
Numerator = to be calculated
Denominator = 12 ( full tank of gas )


As jayhawlk mentions: one has to find out how much gallons is used for 5 hours.

From the problem
1 gallon = 30 miles @ 50 miles per hour
So to travel 50 miles in one hour, car consumes 50/30 = 5/3 gallons.

We need to find out what is the consumption for 5 hours = 5 * consumtioon for 1 hours = 5 * (50/30) = 25/3

So the final solution is (25/3)/12 = 25/36

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