rohit8865 wrote:

Bunuel wrote:

If j is an integer, is k an integer?

(1) j – 2k is an integer.

(2) 5k – j is an integer.

let j=10

(1) then, if k=1 then yes

k=1/2 No ....insuff

(2) k=1 then yes

k=1/5 then No...insuff..

combined k must be ineteger....suff

Ans C

Questions asks if k is an integer? J is already integer. (it can be positive or negative).

A) is quite clear, its is INSUFFICIENT

in B if, k = 0.2 (which is 1/5) --> 5(0.2) - j (the integer) --> 1 - 2 = -1 there fore k is NOT integer.(is j is 2, 3, 4.. since answer is an integer, so answer can be negative or positive).

On the other hand, if k =1 --> then 5 - 4 (if j = 4) --> 1 or 5 - (-2) --> 7. Again K is Integer.

So both are INSUFFICIENT.

Hence E

How is C the answer? Could you give me a little detail into the solving? Thank you, it would be highly appreciated