What number comes next in this sequence:
7 8 5 5 3 4 4 _

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

Prove that the below maths equation is true.

8 + 8 = 91

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

Can you decipher the two rows to find the hidden word?

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