This is a beautiful puzzle contributed by Suman Saraf – thanks Suman!
A wooden block is divided into eight smaller blocks by the three cuts, as shown in the figure. The areas of the seven visible blocks are labeled. What is the area of the 8th block?
As always, please send your answers as comments within the blog (preferred), or send an e-mail to firstname.lastname@example.org. Please do share the puzzle with others if you like, and please also send puzzles that you have come across that you think I can share in this blog.
Happy blocking and tackling!