During which month do people sleep the least?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

There are 3 apples in the basket and you take away 2. How many apples do you have now?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Do You See It?

I travel all around the world but always stay in the corner. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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

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

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?