A man dies of old age on his 25 birthday. How is this possible?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A mother is 21 years older than her child. In exactly 6 years from now, the mother will be exactly 5 times as old as the child.
Where's the father?

You need to remove two matchsticks to make the below equation true. Can you do it ?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Prove that twice of ten is the same as twice of eleven.

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

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

What is it?