Are you smarter than a Singaporean ten-year-old?
Can you beat Sherlock Holmes?
If you think the answer is yes - I challenge you to solve my problems.
Alex Bellos is brilliant on all things mathematical. He has a degree in Mathematics and Philosophy from Oxford University. His bestselling books
Alex's Adventures in Numberland and
Alex Through the Looking-Glass have been translated into more than 20 languages. He is the co-author of a mathematical colouring book,
Snowflake, Seashell, Star, and he has launched an elliptical pool table, LOOP. He writes a popular maths blog and a puzzle blog for the
Guardian. His next book,
Puzzle Ninja, will be published in October 2017.