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If y = (5x)^1/2 where x and y are integers, what is the
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Updated on: 20 Jul 2014, 09:49
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54% (01:40) correct 46% (01:54) wrong based on 333 sessions
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If \(y = \sqrt{5x}\) where x and y are positive integers, what is the remainder when x is divided by 5? (1) x < 5 (2) y > 1 Another question from me. No OA as this is my own question. Please let me know if you dont agree with my answer and if so, the reason.. . Here goes.. Source : Me..
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Originally posted by MacFauz on 11 Dec 2012, 04:23.
Last edited by Bunuel on 20 Jul 2014, 09:49, edited 3 times in total.
Renamed the topic and edited the question.



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Re: If y = (5x)^1/2 where x and y are integers, what is the
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11 Dec 2012, 04:52
If \(y = \sqrt{5x}\) where x and y are positive integers, what is the remainder when x is divided by 5?Since square root from a negative number is undefined and \(y\) is a positive integer, then \(5x>0\) > \(x<5\). Since also given that \(x\) is positive, then \(0<x<5\), thus \(x\) could be 1, 2, 3 or 4. Now, \(y\) would be an integer only for \(x=1\) or \(x=4\). If \(x=1\), then \(y=2\). If \(x=4\), then \(y=1\). (1) x < 5. Not sufficient. (2) y > 1 > \(y=2\) > \(x=1\). Sufficient. Answer: B.
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Re: If y = (5x)^1/2 where x and y are integers, what is the
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11 Dec 2012, 10:47
MacFauz wrote: If \(y = \sqrt{5x}\) where x and y are positive integers, what is the remainder when x is divided by 5? (1) x < 5 (2) y > 1 Another question from me. No OA as this is my own question. Please let me know if you dont agree with my answer and if so, the reason.. . Here goes.. Source : Me.. Sq root of a neg number is not defined, hence 5x >0 or x<5 now x is a positive integer hence X lies between 1 & 5 . 1) X<5  Already determined , but not sufficient 2) y>1  next integer y= 2 ; => x = 1 Hence remainder when X divided by 5 is 1 Ans B



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Re: If y = (5x)^1/2 where x and y are integers, what is the
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10 Aug 2013, 07:56
y^2 = 5 x
x= 5  y^2
(1).
x=1,4 since x<5
(2).
y>1
x=1 hence REM=1
Hence (B)



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Re: If y = (5x)^1/2 where x and y are integers, what is the
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22 Sep 2015, 00:43
y=sqrt*(5x) y^2=5x y^2+x=5
x/5=q+R , what is R?
St1. x<5, no new information, INSUFF
St2. y>1 means y=2, so x=1. R=1. SUFF
B



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Re: If y = (5x)^1/2 where x and y are integers, what is the
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19 Oct 2018, 11:45
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Re: If y = (5x)^1/2 where x and y are integers, what is the
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19 Oct 2018, 11:45






