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

What Time Should the last watch show in the below figure?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

A man dies of old age on his 25 birthday. How is this possible?

When does a USA Potato change its nationality?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

Two natural numbers have a sum of less than 100 and are greater than one.

John knows the product of the numbers and Jacob knows the sum of numbers.

The following conversation takes place between them:
John: 'I am not aware of those numbers.'
Jacob: 'I knew you wouldn't be. I am not aware myself.'
John: 'Now I know them!'
Jacob: 'Now I know them, too!'

What are the two numbers?

Why did Navjot Singh Sidhu put the new January calendar in the freezer

What does it mean?