You need to arrange three 7 and mathematical symbols to form number 1?

Which is the smallest number that you can write using all the vowels exactly once?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

What four weights can be used to balance from 1 to 30 pounds?

What is black when you buy it, red when you use it, and gray when you throw it away?

How old is your son? asked a man to his neighbour. My son is five times as old as my daughter and my wife is five times as old as my son. I am twice as old as my wife whereas my grandmother, who is celebrating her eighty-first birthday is as old as all of us put together.

How old is the man's son ?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Be active and find the killer in the picture Riddle below.

Can you identify the famous TV character from the rebus below?