What number should come in place of the question mark below?

Can you tell a 3D object that has just two surfaces?

When 99 is considered higher than 100?

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

Find the hidden tiger in the given optical illusion ?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?