How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Move three sticks of the spiral below to form a square.

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

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

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

There is something which is always coming but never arrives?

Which number should replace the question mark?

Which is heavier: a ton of bricks or a ton of feathers?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?