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30 May 2012, 17:27
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
84% (01:05) correct
16%
(01:18)
wrong
based on 57
sessions
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Not Attempted Yet
If r/s = 2/5 , what is the value of rs ?
(1) If 2s/5 is multiplied by 12, the result is 25.
(2) If 5r/2 is multiplied by 4, the result is 250.
Though it looks like standard D (two unknowns, two equations : one equation in question stem and one equation from each answer choices) I'm getting two different values of r and 2 from two statements.
So in such cases, the answer should be E. What do you guys think?
Or am I making another silly calculation mistake?
Source : Jeff Sachmann DS challenge
(1) If 2s/5 is multiplied by 12, the result is 25.
(2) If 5r/2 is multiplied by 4, the result is 250.
Though it looks like standard D (two unknowns, two equations : one equation in question stem and one equation from each answer choices) I'm getting two different values of r and 2 from two statements.
So in such cases, the answer should be E. What do you guys think?
Or am I making another silly calculation mistake?
Source : Jeff Sachmann DS challenge
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31 May 2012, 02:40
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If r/s = 2/5 , what is the value of rs ?
(1) If 2s/5 is multiplied by 12, the result is 25. We have that 2s/5*12=25 and r/s=2/5 --> we can solve for r and s and thus get the value of rs. Sufficient. Notice that from this statement r=25/12 and s=125/24.
(2) If 5r/2 is multiplied by 4, the result is 250. We have that 5r/2*4=250 and r/s=2/5 --> we can solve for r and s and thus get the value of rs. Sufficient. Notice that from this statement r=25 and s=125/2.
Now, technically answer should be D, as EACH statement ALONE is sufficient to answer the question.
But even though formal answer to the question is D (EACH statement ALONE is sufficient), this is not a realistic GMAT question, as: on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.
So, the question is flawed. You won't see such a question on the GMAT.
Hope it's clear.
(1) If 2s/5 is multiplied by 12, the result is 25. We have that 2s/5*12=25 and r/s=2/5 --> we can solve for r and s and thus get the value of rs. Sufficient. Notice that from this statement r=25/12 and s=125/24.
(2) If 5r/2 is multiplied by 4, the result is 250. We have that 5r/2*4=250 and r/s=2/5 --> we can solve for r and s and thus get the value of rs. Sufficient. Notice that from this statement r=25 and s=125/2.
Now, technically answer should be D, as EACH statement ALONE is sufficient to answer the question.
But even though formal answer to the question is D (EACH statement ALONE is sufficient), this is not a realistic GMAT question, as: on the GMAT, two data sufficiency statements always provide TRUE information and these statements never contradict each other.
So, the question is flawed. You won't see such a question on the GMAT.
Hope it's clear.
31 May 2012, 06:25
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Thanks Bunuel! Its perfectly clear now.
