Data sufficiency
If
N = 3x x 5y, where x and y are positive integers, and N
has 12 positive factors, what is the value of N?
(1) 9 is NOT a factor of N
(2)
125 is a factor of N
The product of (6,2) (4,3) give 12.
Hence the pair combinations of x and y can be (5,1)(11,0),(3,2) { x =5 and y=1 or x=1 and y=5)
Hence N = 3x x 5y
As per statement 1. If 9 is not a factor of N. It means the values of x and y should be (1,5)
sufficient.
As per statement 2. if 125 is a factor of N, it means the values of x and y can be any combination.
Hence A
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