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

Explain how?

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?

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)?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Jessica is telling her friends this story and asks them to guess if it’s the truth or a lie: “There was a man sitting in a house at night that had no lights on at all. There was no lamp, no candle, and no other source of light. Yet, he sat in the house and read his book happily.” Her friends say she’s lying, but Jessica corrects them and says she’s telling the truth. Jessica’s story is true—but how?

What seven-letter word has hundreds of letters in it?

What is the largest number you can write with just 3 digits?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?