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01 Dec 2013, 17:36
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
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Question Stats:
60% (01:47) correct
40%
(01:26)
wrong
based on 301
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Is √(56x) an integer?
(1) x is a multiple of 14.
(2) 28 is not a factor of x.
(1) x is a multiple of 14.
(2) 28 is not a factor of x.
02 Dec 2013, 02:06
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Is √(56x) an integer?
\(\sqrt{56x}=2\sqrt{14x}\).
(1) x is a multiple of 14. If x=14, then the answer is YES but if x=14*3, then the answer is NO. Not sufficient.
(2) 28 is not a factor of x. Consider the same examples. Not sufficient.
(1)+(2) Consider the same examples. Not sufficient.
Answer: E.
\(\sqrt{56x}=2\sqrt{14x}\).
(1) x is a multiple of 14. If x=14, then the answer is YES but if x=14*3, then the answer is NO. Not sufficient.
(2) 28 is not a factor of x. Consider the same examples. Not sufficient.
(1)+(2) Consider the same examples. Not sufficient.
Answer: E.
jlgdr
Joined: 06 Sep 2013
Last visit: 24 Jul 2015
Posts: 1,299
Given Kudos: 355
Concentration: Finance
Schools: Wharton '17 (A) HBS '17 (WA$)
06 Jan 2014, 10:16
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honchos
OK here's the deal
We need to know if X has at least 2 and a 7^2 for 56x to be a perfect square
Statement 1
Is a multiple of 2*7, OK, thanks for the info but we are still missing one 7
Statement 2
Not a factor of 2^2*7. Well OK, doesn't have a square power of 2 but could as well have a square power of 7. I need more info
Statement 1 and 2 together
Well we are still missing that 7!!
Answer is E
Cheers!
If it helps Kudos me ok?
J
