Can you solve this challenging problem from the Mathematical Olympiad of Singapore? Thanks to Truong from Vietnam for the suggestion!

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Mind Your Decisions: Five Book Compilation
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"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" rated 3.7/5 stars on 11 reviews
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"40 Paradoxes in Logic, Probability, and Game Theory" rated 4/5 stars on 23 reviews
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"The Best Mental Math Tricks" rated 4.4/5 stars on 38 reviews
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"Multiply Numbers By Drawing Lines" rated 4.5/5 stars on 19 reviews
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Mind Your Puzzles: Collection Of Volumes 1 To 3
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"Math Puzzles Volume 1" rated 4.6/5 stars on 40 reviews
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"Math Puzzles Volume 2" rated 4.5/5 stars on 14 reviews
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"Math Puzzles Volume 3" rated 4.6/5 stars on 12 reviews
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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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