Solution:

Answer B or C

Solution:

This statement is true but only in a specific case i.e. if both of the siblings continue to live till the day the younger is as old as the elder one was during the time of their birth.

Solution:

Put one red marble in one box and all other marbles in the 2nd box.

Probability :
50 + 24/49

Solution:

40 balls

Solution:

13 + 11 + 6 = 30

Explanation
The trick is that you just need to rotate '9' to form '6'.

Solution:

   9567
+ 1085
======
 10652

Solution:

Slumdog Millionare = Slum + Dog + Million + air

Solution:

Now there can be two solutions to the given situation because there can be two situations:
Suppose if B and C have same colors, A will know that his color is the other one and he will be able to speak up the first.
Now if B and C do not have same colors, A will stay silent. This will tell B that his and C's colors are different. Thus he will speak up first.

So either A or B will speak up first depending on the situation.

Solution:

Playing chess

Game needs two players so Brother-8 is playing chess with Brother-2

Solution:

'five'

Its the count of alphabet

Solution:

"World War I" was named after after "World War II"