Find out the missing number in the picture attached:

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What begins with T, ends with T, and has T in it?

I have no life, but I can die. What am I?

What does does this rebus picture means ?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?