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 Author: questioner [ Tue Feb 22, 2011 3:25 pm ] Post subject: GMAT Rate A certain car can currently travel 17 miles per gallon of gasoline. After a tune-up, the car will use 80 percent as much gasoline as it does now. How many miles will the car be able to travel per gallon of gasoline after the tune-up?A. 13.6B. 15C. 20.4D. 21.25E. 23.5(D) After the tune-up, the car will travel 17 miles on 80% of a gallon of gasoline, which means it will travel 17 miles on 8/10, or 4/5, of a gallon of gasoline.To solve for the number of miles that the car will be able to travel per one gallon of gasoline, we need to set up the following proportion:17 miles is to 4/5 gallon as X miles is to 1 gallon.Algebraically, this is expressed as:17/(4/5) = X/1X = 17 × 5/4X = 85/4 = 21 1/4.So the car will be able to travel 21.25 miles per gallon of gasoline after the tune-up.The correct answer is choice (D).-----------In this question you state that the car will use 80% AS MUCH GASOLINE AS IT DOES NOW. According to my understanding this should be - what the car uses now plus 80% not 80% of the current usage. Am I right? Or could you please explain the wording of the question? Thank you.

 Author: Gennadiy [ Tue Feb 22, 2011 3:29 pm ] Post subject: Re: GMAT Rate "the car will use 80 percent as much gasoline as it does now" means:The car will use 80% of what it uses now."the car will use 80 percent MORE gasoline THAN it does now" would mean:The car will use 80% MORE on top of 100% THAT it uses now. (in other words "180% of what it uses now").

 Author: questioner [ Mon Jul 11, 2011 3:48 pm ] Post subject: Re: GMAT Rate This question is quite confusing. When you say the car will use 80% as much gasoline as it does now, this should mean 80% more of its current use not 80% of its current use, shouldn't it?

 Author: Gennadiy [ Mon Jul 11, 2011 4:10 pm ] Post subject: Re: GMAT Rate

 Author: questioner [ Thu Sep 22, 2011 11:58 am ] Post subject: Re: GMAT Rate But the simplest way to calculate this is 17/0.8 and the answer will be 21.25.

 Author: Gennadiy [ Thu Sep 22, 2011 12:14 pm ] Post subject: Re: GMAT Rate

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