Find out the missing number in the picture attached:

I am lying and I always lie. Tell me whether I am lying or telling the truth.

John has eleven friends. He has a bowl containing eleven apples. Now He wants to divide the eleven apples among his friends, in such a way that an apple should remain in his bowl.
How can He do it?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

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 taste better than I can smell. Who am I?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

I have an eye but still cannot see.

Who am I?