What English word has three consecutive double letters?

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?

A pack of cards has 40 cards. You are blindfolded. Out of 40, 25 cards are facing down while 15 are facing up. You have been asked to divide this pack of cards into two decks - so that each deck contains an equal number of face-up cards. Remember, you are blindfolded.

How will you do it?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

How many triangles are there in the picture below?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A man dies of old age on his 25 birthday. How is this possible?

What can you see in the middle of March and April that you can never see in any other month?

Why is Saturday stronger than Monday?

You need to move three matchsticks to form three squares. Can you do it?