I’m tall when I’m young, and I’m short when I’m old. What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Replace the question mark with the correct number.

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

How can you take 2 from 5 and leave 4?

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?

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?