10+10 and 11+11 can give you the same answer.

Explain how?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

What's a single-digit number with no value?

Before Mount Everest was discovered, what was the highest mountain in the world?

Give it food and it will live; give it water and it will die.

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What does this rebus means ?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?