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31 Dec 2017, 12:18
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
72% (01:12) correct
28%
(01:16)
wrong
based on 174
sessions
History
Date
Time
Result
Not Attempted Yet
Is y an integer?
(1) When y is divided by two, the result is the square of an integer.
(2) When y is multiplied by two, the result is the square of an integer
(1) When y is divided by two, the result is the square of an integer.
(2) When y is multiplied by two, the result is the square of an integer
31 Dec 2017, 14:03
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Bunuel
As this question has almost no technical details (numbers/equations) we'll look for a Logical approach.
(1) We'll start from the end: the square of an integer must be an integer.
Since an integer times 2 is still an integer, y must also be an integer.
Sufficient!
(2) Similarly to the above, the square of an integer is an integer.
However, without knowing if this integer is divisible by 2, we can't know if y is an integer or not.
Insufficient!
(A) is our answer.
SchruteDwight
Joined: 03 Sep 2018
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23 Aug 2019, 00:59
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1) Y/2=Z^2 (Z means integer)
-> Y=Z^2*2 –> Sufficient: Integer*integer=integer
2) Y*2=Z^2
–> Y=Z^2/2 –> Insufficient: 36/2=18 (YES) 9/2=4.5 (NO)
-> Y=Z^2*2 –> Sufficient: Integer*integer=integer
2) Y*2=Z^2
–> Y=Z^2/2 –> Insufficient: 36/2=18 (YES) 9/2=4.5 (NO)
