Replace the question mark with the number below given a simple math problem.
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)?
What has 13 hearts but no other organs?
Can you name an animal whose killing cannot be performed without spilling your own blood?
I am a prime number. The double of myself is equal to the square of me. which number am I?
By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?
Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?
Keyboard words are not in alphabetical order, Why?
How many letters are in the alphabet?
In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat. Can this even be possible?
What does this mathematical rebus means ?
The word ladder puzzle was invented by Lewis Carroll, author of Alice’s Adventures in Wonderland.
