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21 Aug 2016, 07:33
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
57% (01:21) correct
43%
(01:21)
wrong
based on 206
sessions
History
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Time
Result
Not Attempted Yet
Is the integer z divisible by 6?
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
(1) The greatest common factor of z and 2 is 2.
(2) The greatest common factor of z and 15 is 5.
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
21 Aug 2016, 09:29
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stonecold
Statement I tells us that z is a multiple of 2, but we can't say if it is also a multiple of 3 or not..
Insuff...
Statement II tells us that z and 15 have 5 in common, so z is not a multiple of 3 as 15 is a multiple of 3..
So z is not div by 3 and hence not div by 6..
Ans is NO..
Suff..
B
21 Aug 2016, 10:40
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stonecold
Easy one.
We need to find out whether Z has 2 and 3 as its factors.
(1) The greatest common factor of z and 2 is 2. --> It tells Z has 2 in it but not sure of 3. hence, insufficient.
(2) The greatest common factor of z and 15 is 5 --> It tells Z doesn't have 3 , hence it will never be divisible by 6. hence, Sufficient
Answer is B.
