How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

What does a man do only once in his lifetime, but women do once a year after they are 29?

what does this picture(rebus) riddle means ?

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