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GMATPrep Question

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GMATPrep Question

by jaydeer44 » Fri May 09, 2008 1:25 pm
Can someone help explain how to solve this problem? The Answer is E.


Machines X and Y work at their respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone?

(1) Machines X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does.

(2) Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does.
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Source: — Data Sufficiency |
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by akshatsingh » Sun May 11, 2008 10:09 pm
I think both the statements will only give the ratio, of times of X and Y and not necessarily the exact time taken by each.

The answer should be E.
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GMAT Prep1 Problem

by jaydeer44 » Tue Aug 26, 2008 8:49 pm
Can someone help me understand why the answer is E instead of C? I thought that from statement one and statement two, we can get two distinct equations relating x and y and thus have enough information to solve for either one of the variables.
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by aj5105 » Thu Jan 15, 2009 10:53 pm
Statement 1--[2/3(tx+y) / tx] + [2/3 (tx+y) / ty]

Statement 2--[tx+y / tx] + [tx+y / 2tx]

Together--Not sufficient

Hence E.

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