Curated Video
Can You Solve Amazon's Hanging Cable Interview Question?
A cable of 80 meters (m) is hanging from the top of two poles that are both 50 m from the ground. What is the distance between the two poles, to one decimal place, if the center of the cable is (a) 20 m above ground? (b) 10 m above...
Institute for New Economic Thinking
Lessons Ignored From the 1930s
Walker Todd is an adjunct scholar at the Cato Institute's new Center for Monetary Financial Alternatives, and an Institute grantee. He is also an economic consultant with 20 years' experience at the Federal Reserve Bank of New York and...
Curated Video
Math Magic Card Trick - Rolling 3 Dice
Have a spectator roll 3 dice. Count out cards equal to the sum of the dice. Then remove the middle value dice. From the smaller deck, count out cards equal to the sum of the remaining two dice and place the rest of the deck on top. Do...
Curated Video
Only A "Genius" Can Solve - Each Letter Is A Number
What value is each letter? This is an incredible math problem with just a single solution! Can you figure it out? My blog post for this video https://wp.me/p6aMk-85e Websites consulted http://mathforum.org/library/drmath/view/60417.html...
Curated Video
Can You Solve Homework For 10 Year Olds In China?
Thanks to Eric from Miami for suggesting this problem and sending a solution! The diagram shows a quadrilateral ABCD with the values for some angles and the length of AB. Can you figure out the area of ABCD? Subscribe:...
Curated Video
HARD Geometry Problem: Can You Solve The Horse Grazing Puzzle?
A horse is tied to an outside corner of a 20 foot by 10 foot rectangular barn. What is the maximum area the horse can graze outside, if the rope has length L? Solve for L = 5 and L = 25 (find exact answers). If you are up for a...
Curated Video
Can You Solve The Hardest Easy Geometry Problem?
In the figure, what is the value of angle x? This problem is known as Langley's Adventitious Angles. It is also known as the hardest easy geometry problem because it can be solved by elementary methods but it is notoriously difficult to...