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

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

What does this rebus means ?

PROG WORKRESS

When can we add 2 to 11 and get 1 as the correct answer?

John has played 50 ODI's and his average is 50. How many runs should he score in his 51st ODI, so that his average score jumps to 51?

Replace the question mark with the correct number.

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

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