What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

You can win me and lose me but never buy me
You can not eat me and never want to part with me
I can make you cry or bring you joy
I am not a machine and definitely not a toy
You keep me but i am not forever just yours
You might find me in a case or on a shelf next to a vase
I am hard and i am tall if you bump me i am sure to fall
I am made of different materials and am at many events
If your lucky and fight hard I might be yours
What am I ?

I always drive my customer away.

Who am I?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

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

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

If Rajina's daughter is my daughter's mom, who am I to Rajina?