It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Which five letter word can be added at the end of below word to form a
valid word?

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You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

Can you find the company name in the pictogram below?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Why do you find that most of the buildings are deprived of the 13th floor?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

What kind of tree can you carry in your hand?