How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

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

There are forty elephants and they have forty-fore heads. How can this be possible?

Which is the rope you never skip with?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

What is harder to catch the faster you run?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

What is always in front of you but can’t be seen?

People make me, save me, change me, raise me. What am I?