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

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?

John was born on March 5, 1970, in Delhi, India. Jacob was born 25 days before John. The year when they took birth, Republic Day fell on Monday.

Can you find out on what day was Jacob born?

If eleven plus two equals one, what does nine plus five equal?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What do you see in the image below

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

What does the below image rebus riddle means ?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?