This is a really neat question. Three rectangles are in a row, with areas of 21, ?, and 43 square meters. The second and third rectangles have a total width of 10 meters. A fourth rectangle with area 29 square meters has a height of 4 meters and spans the widths of the top two rectangles. What is the area of the second rectangle in the first row? Special thanks this month to: Robert Zarnke, Kyle, Lee Redden, Mike Robertson, Daniel Lewis. Thanks to all supporters on Patreon! http://www.patreon.com/mindyourdecisions
Credit to Naoki Inaba for inventing these puzzles. I read about it in Alex Bellos article area maze puzzle The Guardian
https://www.theguardian.com/science/2015/aug/03/alex-bellos-monday-puzzle-solution-area-maze-smarter-than-japanese-schoolchild
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Book ratings are from January 2023.
My Books (worldwide links)
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Mind Your Decisions: Five Book Compilation
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A collection of 5 books:
"The Joy of Game Theory" rated 4.3/5 stars on 290 reviews
http://amzn.to/1uQvA20
"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 4.1/5 stars on 33 reviews
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"40 Paradoxes in Logic, Probability, and Game Theory" rated 4.2/5 stars on 54 reviews
http://amzn.to/1LOCI4U
"The Best Mental Math Tricks" rated 4.3/5 stars on 116 reviews
http://amzn.to/18maAdo
"Multiply Numbers By Drawing Lines" rated 4.4/5 stars on 37 reviews
http://amzn.to/XRm7M4
Mind Your Puzzles: Collection Of Volumes 1 To 3
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A collection of 3 books:
"Math Puzzles Volume 1" rated 4.4/5 stars on 112 reviews
http://amzn.to/1GhUUSH
"Math Puzzles Volume 2" rated 4.2/5 stars on 33 reviews
http://amzn.to/1NKbyCs
"Math Puzzles Volume 3" rated 4.2/5 stars on 29 reviews
http://amzn.to/1NKbGlp
2017 Shorty Awards Nominee. Mind Your Decisions was nominated in the STEM category (Science, Technology, Engineering, and Math) along with eventual winner Bill Nye; finalists Adam Savage, Dr. Sandra Lee, Simone Giertz, Tim Peake, Unbox Therapy; and other nominees Elon Musk, Gizmoslip, Hope Jahren, Life Noggin, and Nerdwriter.
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