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

What is the word or phrase?

There are three boxes on a table. One of the box contains Gold and the other two are empty. A printed message contains in each box. One of the message is true and the other two are lies.

The first box says "The Gold is not here".

The Second box says "The Gold is not here".

The Third box says "The Gold is in the Second box".

Which box has the Gold?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

If a zookeeper had 100 pairs of animals in her zoo, and two pairs of babies are born for each one of the original animals, then (sadly) 23 animals don’t survive, how many animals do you have left in total?

If 21x = 79x, what is the value of x?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Can you guess the name of the month by looking the below rebus ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?