48÷2(9+3) = ? Mathematician Explains The Correct Answer

What is 48÷2(9+3) = ? This problem went viral and generated millions of comments on Facebook, Twitter, YouTube and social media sites. I explain how to get the correct answer by using the modern interpretation of the order of operations. I also explain how you would get a different answer under historical usage of the division symbol.

I studied Mathematics and Economics at Stanford. Press coverage of my work:
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*I get many, many emails about this problem and am unable to reply to them.

Blog (text explanation): https://wp.me/p6aMk-5g5

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
http://www.jstor.org/stable/2972726?seq=1#page_scan_tab_contents

Google evaluation
https://www.google.com/#q=48%C3%B72(9%2B3)

WolframAlpha evaluation
http://www.wolframalpha.com/input/?i=48%C3%B72(9%2B3)

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