Prove that twice of ten is the same as twice of eleven.

The centre of the third figure is empty. What digit should fit inside?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?

I can be cracked, made, told, and played. What am I?

I am white when I am dirty, and black when I am clean. What am I?

Can you make a six-letter word using the letters N, A and B ?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

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

The answer I give is yes, but what I mean is no. What was the question?

1. How can we put an elephant in the refrigerator?
2. How can we put a Giraffe in a refrigerator?
3. The king of the jungle invites all the animals to a party everyone comes except for one animal, which animal?
4. You come to a crocodile-infested lake, you can't go around it, you can't co under it and you can't go over it, how do you get across?