6÷2(1+2) = ? Mathematician Explains The Correct Answer.

What is 6÷2(1+2) = ? 

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. 

(Note: some people write 6/2(1 + 2) = but this has the same answer.)