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11 Mar 2020, 02:46
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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:
25%
(medium)
Question Stats:
71% (01:19) correct
29%
(01:01)
wrong
based on 75
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If z is an integer, is Z/4 also an integer?
(1) z is a factor of 24.
(2) Z/3 is an integer.
(1) z is a factor of 24.
(2) Z/3 is an integer.
11 Mar 2020, 06:41
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770GMAT
If z is an integer, is Z/4 also an integer?
(1) z is a factor of 24.
(2) Z/3 is an integer.
(1) z is a factor of 24.
(2) Z/3 is an integer.
Target question: Is Z/4 an integer?
When I SCAN the two statements, they both feel insufficient, AND I’m pretty sure I can identify some cases with conflicting answers to the target question. So, I’m going to head straight to……
.
.
.
Statements 1 and 2 combined
There are several values of z that satisfy BOTH statements. Here are two:
Case a: z = 12. In this case, 12/4 = 3, so the answer to the target question is YES, z/4 is an integer
Case b: z = 6. In this case, 6/4 = 1.5, so the answer to the target question is NO, z/4 is not an integer
Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
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