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21 Jan 2010, 13:48
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hey everyone!
so i'm contemplating business school and decided to take one of the GMATPREP practice exams recommended in the thread "study plan for novices".
one of the problems i missed in the quant section went like this:
machine 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) x and y working together fill a production order of this size in 2/3rds the time that machine x working alone does.
---> clearly x works twice as fast as y.
2) machine y working alone, fills a production order of this size in twice the time that machine x, working alone, does.
---> even more clearly x works twice as fast as y.
the answer i put down was both are sufficient alone since they both state that it would take y twice as many hours yet the answer says neither are sufficient either alone or in tandem.
the question states "how many hours" and "twice as many" isn't legit. am i needing an actual number here or did i screw up somewhere else?
so i'm contemplating business school and decided to take one of the GMATPREP practice exams recommended in the thread "study plan for novices".
one of the problems i missed in the quant section went like this:
machine 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) x and y working together fill a production order of this size in 2/3rds the time that machine x working alone does.
---> clearly x works twice as fast as y.
2) machine y working alone, fills a production order of this size in twice the time that machine x, working alone, does.
---> even more clearly x works twice as fast as y.
the answer i put down was both are sufficient alone since they both state that it would take y twice as many hours yet the answer says neither are sufficient either alone or in tandem.
the question states "how many hours" and "twice as many" isn't legit. am i needing an actual number here or did i screw up somewhere else?
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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21 Jan 2010, 14:56
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philiptraum
You should notice that there are three variables in problems of this kind. The rate, the time taken and the quantity. If you know any of the two, you can calculate the other one. And when two objects are participating, such as two machines, you need atleast two variables of each of the objects, to be able to accurately compare and point out any differences between the objects.
If you plug-in numbers for the speeds of x and y, and the operational times for each of them, both the statements can come up with numerous possibilities. Hence, option E is correct.
21 Jan 2010, 15:21
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thanks barney, i appreciate the response.
it wasn't the math that gave me any issues in fact my answer "twice as many hours" is simply a more succinct version of your explanation. my question dealt with how specific the answer actually had to be.
as it was my first experience taking the gmat i assumed, perhaps incorrectly, that when asked "how many" i could respond with "twice as many" since "twice as many" is always the correct answer regardless of the input for any of the variables. i guess my question revolves around the difference between a specific numerical answer, say 4, versus "twice as many".
it wasn't the math that gave me any issues in fact my answer "twice as many hours" is simply a more succinct version of your explanation. my question dealt with how specific the answer actually had to be.
as it was my first experience taking the gmat i assumed, perhaps incorrectly, that when asked "how many" i could respond with "twice as many" since "twice as many" is always the correct answer regardless of the input for any of the variables. i guess my question revolves around the difference between a specific numerical answer, say 4, versus "twice as many".
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
