You need to move three matchsticks to form three squares. Can you do it?

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

What do you get if you add 2 to 100 four times?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Name a key which is hardest to turn.

Why do people go to bed?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

I am the fastest animal but cannot climb the tree. What am I?