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

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

What always comes into a house through the keyhole?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Can you place three balls such that the equation shown in the picture holds true?

A woman shoots her husband.

Then she holds him under water for over 5 minutes.

Finally, she hangs him.

But 5 minutes later they both go out together and enjoy a wonderful dinner together.

How can this be?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

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 am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?