How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

When it is alive we sing, when it is dead we clap our hands. What is it?

If two fifty-foot ropes are suspended from a forty-foot ceiling that is twenty feet apart, how much rope will you be able to steal if you have a knife?

What does this mathematical rebus means ?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

A bomb exploded in a room full of married couples and no one died. How?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Forwards I am heavy, backward I am not. What am I?