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)?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

How many runs at maximum can a batsman score in a normal one-day match? Consider the fact that the conditions are ideal and there are no No Balls, no Wide Balls and no Extras in that match.

What happened when the wheel was invented?

Using eight eights and addition only, can you make 1000?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Can you solve the maths in the below-given picture equation?

10+10 and 11+11 can give you the same answer.

Explain how?