Numbers - General Aptitude

Q1:

If the number 5 * 2 is divisible by 6, then * = ?

A 2

B 3

C 6

D 7

ANS:A - 2

6 = 3 x 2. Clearly, 5 * 2 is divisible by 2. Replace * by x. Then, (5 + x + 2) must be divisible by 3. So, x = 2.