How many words can a pen with half refill write?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

Here is a conversation between a couple who both are software professionals.

Husband: Hey! What is your date of birth?
Wife Replied Angrily: It is 591062400
Husband after doing some calculations replied, "Got It".

What is the DOB of the wife?

What does the below rebus puzzle mean?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

There are forty elephants and they have forty-fore heads. How can this be possible?