Mathematics

Collection by Mind Your Decisions • Last updated 4 hours ago

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Best Meeting Spot For 4 Friends

Which point is "closest" to 4 friends? Thanks to Chanul for suggesting this problem, which is adapted from a Sri Lankan Olympiad question. Special thanks thi...

Only 10 Percent of Students Solved This

Can you solve this problem that stumped many advanced math students? References https://io9.gizmodo.com/ready-this-simple-puzzle-once-stumped-96-of-americas-...

The Stacked Cubes Puzzle

This is a fun one! Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Send me suggestions by email (address in video). I consider a...

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The Folded Square Puzzle

I thank Ankit and Amlan for the suggestion! This problem is adapted from an examination at the prestigious Chennai Mathematical Institute. Subscribe: https:/...

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Can You Solve The 6 Cards Game?

It takes perfect logical reasoning to solve this puzzle. I thank Joe for the suggestion! Reference to TED-Ed talk by Maurice Ashley https://www.youtube.com/w...

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The Last Side Puzzle

This was given to 9th and 10th grade students in a math competition. Can you figure it out? References Question 23 of Kangaroo competition https://www.matema...

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The Unfolded Box Puzzle

This is a tricky but fun geometry problem! Special thanks this month to: Michael Anvari, Kyle. Thanks to all supporters on Patreon! http://www.patreon.com/mi...

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Magical Triangle - Think Outside The Box!

Many people requested this one. It was asked to 9th grade students in India who had only learned geometry, so you are supposed to solve it without using trig...

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For The Benefit Of Mr. Kite's Midpoint

Thanks to Neelesh for the suggestion! This problem is adapted from the JEE Mains test in India. References https://doubtnut.com/question-answer/let-a-b-is-th...

Mathematics Squares Math Bobs

A Circle With 4 Squares

This is a neat problem! Puzzle adapted from Cshearer41 https://twitter.com/Cshearer41/status/1247073195829669893 Solve for the radius - harder than it looks ...

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Surprisingly Hard Angle Problem

Many people asked me to solve this one! What is the value of x? Many more solutions https://twitter.com/preshtalwalkar/status/1254337151359234049 Solution by...

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The Cornered Circle Puzzle

Thanks to Manoj and Katlego for the suggestion! Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation=1 Send me suggestions by email (ad...

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Ladder And Box Puzzle

Special thanks this month to: Michael Anvari, Kyle. Thanks to all supporters on Patreon! A ladder leans against a wall, just touching the corner of a cubical...

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The Folded Semicircle Puzzle

This problem is adapted from a Belgian Olympiad. I thank Jente for the suggestion! Subscribe: https://www.youtube.com/user/MindYourDecisions?sub_confirmation...

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Insanely Hard Problem - Solve For The Angle

I admit I didn't solve this one! Sources https://www.duckware.com/tech/worldshardesteasygeometryproblem.html https://www.cut-the-knot.org/triangle/80-80-20/I...

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The Square Inside The Square

Many people asked me to solve this one! And you know which theorem will come in handy to solve it ;) References https://math.stackexchange.com/questions/2518...