If 21x = 79x, what is the value of x?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Mr Red Lives in the red house.
Mr Green Lives in the greenhouse.
Mr Yellow Lives in the yellow house.

Who lives in the Whitehouse?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

What has one letter and starts with an E?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

Can you find the 09 errors in the picture below?

Can you place three balls such that the equation shown in the picture holds true?