If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

I’m tall when I’m young, and I’m short when I’m old. What am I?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

What jumps when it walks and sits when it stands?

How many letters are in the alphabet?

What have one eye but still cannot see?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?