What’s the number?
It’s not easy having a mathematics professor as a new friend. When she invites you to her house she says, “All the houses on my side of the street are numbered consecutively in even numbers. There are six houses on my side of my block and the sum of their numbers is 9870. You don’t know which block I live on, and it’s a long, long street, but I will tell you that I live in the lowest number on my side of the block. What’s the number? Or are you just going to ring the first even-numbered doorbell for twenty blocks?
Click here for the solution
She lives at number 1640.
A man is trapped in a room. The room has only two possible exits: two doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing...