How many sides does a circle have?

Which number should replace the question mark?

There are forty elephants and they have forty-fore heads. How can this be possible?

what does the below math rebus puzzle mean?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Can you find out the missing number in the grid?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

When can we add 2 to 11 and get 1 as the correct answer?