There are many ways to kill time on a long train journey, sitting on a bus, or whilst in a waiting room. Reading a book, scrolling social media, or picking up a copy of a newspaper are some of the most common ways to make that time go by a little easier.

Another option is trying out a brainteaser and giving the mind a little exercise, but with a fun twist. There are three main types of brainteasers. They can be observational, analytical, or mathematical.

Mathematical brainteasers ask users to…