What is 60÷5(7-5) = ? Everyone is arguing about this problem, so let’s figure out the correct answer! The problem involves the order of operations, historical math notation, and binary expression trees. Glad to see the world is passionate about mathematics!
I studied Mathematics and Economics at Stanford. Press coverage of my work:
*I get many, many emails about this problem and am unable to reply to them.
Here is a 1917 article from “The American Mathematical Monthly” that explains the usage of the division symbol as an exception to the order of operations
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What is 6÷2(1+2) = ? The Correct Answer Explained
9 – 3 ÷ 1/3 + 1 = ? The Correct Answer (Viral Problem In Japan)
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My Books
“The Joy of Game Theory” shows how you can use math to out-think your competition. (rated 3.9/5 stars on 35 reviews)
“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 4.6/5 stars on 3 reviews)
“Math Puzzles Volume 1” features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
“Math Puzzles Volume 2” is a sequel book with more great problems. (rated 4.5/5 stars on 6 reviews)
“Math Puzzles Volume 3” is the third in the series. (rated 4/5 stars on 6 reviews)
“40 Paradoxes in Logic, Probability, and Game Theory” contains thought-provoking and counter-intuitive results. (rated 4.4/5 stars on 13 reviews)
“The Best Mental Math Tricks” teaches how you can look like a math genius by solving problems in your head (rated 4.8/5 stars on 5 reviews)
“Multiply Numbers By Drawing Lines” This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 4.3/5 stars on 6 reviews)
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