When monkey rotate the gear, which mark will be hit 1 or 2 ?

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

Decode this picture on T-Shirt and tell what it says ?

Replace the question mark with the correct number in below Picture:

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

What word is pronounced the same if you take away four of its five letters?

Suppose that you are trapped on the surface of a frozen lake. The surface is so smooth and ideal that there is no friction at all. You cant make any grip on the ice and no wind is blowing to help you out. You have just a mobile phone with you which has got no reception disabling you to call for help.

How will you plan your escape before you freeze to death on the frozen lake?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?