What has a ring but no finger?

10+10 and 11+11 can give you the same answer.

Explain how?

In the picture given below, can you find out which digit will take place of the question mark?

Can you decipher the two rows to find the hidden word?

Buy me, smell me or deliver me, I do not change.

Who am I?

Through your logical capabilities, can you make 7 an even?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What goes up but never comes down?

What am I?