Remove two matchsticks to make the below equation correct.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

What have one eye but still cannot see?

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

No matter how little or how much you use me, you change me every month. What am I?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

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?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?