Can you spot the hidden girl in the picture below?

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

Explain how?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

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

What's the only room from which no one can enter or leave

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

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

What's a single-digit number with no value?