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 does this Rebus Picture mean?

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If you say my name, I will no longer exist. What am I?

Can you place six X (crosses) in below board without making three in a row in any way ?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?