If eleven plus two equals one, what does nine plus five equal?

Name a key which is hardest to turn.

There is a dressing drawer which contains the following coloured socks in pairs: Purple, Magenta, Crimson, White, Yellow and Turquoise. Now, the socks are paired and each pair is together in the matching set. There is no light in the room and you open the drawer and pick up a pair. Then, without noticing any colour, you keep them back and pick them up again.

Can you calculate the probability that the pair of socks was Yellow both times?

What is wrong in the below Picture?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Be active and find the killer in the picture Riddle below.

A boy and his father are caught in a traffic accident, and the father dies. Immediately the boy is rushed to a hospital, suffering from injuries. But the attending surgeon at the hospital, upon seeing the boy, says 'I cannot operate. This boy is my son.' How is this situation explained?

I have branches, but no fruit, trunk or leaves. What am I?

Why did the Girl throw the butter out of the window?