A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

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?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

Can you count the number of lines in the below picture?

What does below chemistry rebus means?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

There was a strange boy who was born before his father. How can this be possible?

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

They are three errirs in this question. Can you find them?