This document contains 10 brain teaser questions with their answers. Some of the questions are: - How long will it take to boil 3 eggs if it takes 85 seconds to boil 2 eggs? - When does Chicago begin with a 'C' and end with an 'E'? - How many children does my neighbour have if they have 4 daughters and each daughter has a brother? - What do female elephants have that no other female animal has?