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...

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

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...

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...

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...

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...

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...

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

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...

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

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...

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

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...

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...