I add 5 to 9 and get 2. The answer is correct, so what am I?

A sundial has the fewest moving parts of any timepiece. Which has the most?

A large water tank has two inlet pipes (a large one and a small one) and one outlet pipe. It takes 3 hours to fill the tank with the large inlet pipe. On the other hand, it takes 6 hours to fill the tank with the small inlet pipe. The outlet pipe allows the full tank to be emptied in 9 hours.

What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

What question can you never answer yes to?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

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

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