Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

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

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Solve the puzzle by telling what does below picture means.

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

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One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

Can you solve the rebus below?

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How can this be possible?

How many squares, of any size, can you find on this chessboard which do not contain a Rook?