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11 May 2021, 01:30
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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:
35%
(medium)
Question Stats:
66% (01:02) correct
34%
(00:56)
wrong
based on 102
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of the greatest common divisor of integers a and b?
(1) a is divisible by 15.
(2) b = 2a
(1) a is divisible by 15.
(2) b = 2a
16 May 2021, 04:00
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Bunuel
The easiest way would be just to try different numbers. Clearly (1) and (2) alone are not sufficient. Now if we take them together:
If \(a=15\) then \(b=2a=30\) and GCD of \(a\) and \(b\) is 15 but if \(a=30\) then \(b=2a=60\) and GCD of \(a\) and \(b\) is 30. Two different answers not sufficient.
Answer: E.
General Discussion
11 May 2021, 03:59
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Bunuel
statement: 1 a is divisible by 15.
a=15k
i.e a can be 15, 30, 45, 60...etc
No information about b; hence, Not sufficient
Statement:2
b = 2a
or a is a factor of b or greatest common divisor of "a and b" will be equal to a
No information about a; Hence, Not sufficient
Combined
Value of a is not known; Hence, not sufficient
E is the answer IMO
