The Seemingly Simple 'Math' Problem That Stumped the Internet - Mental Floss

Mental Floss
The Seemingly Simple 'Math' Problem That Stumped the Internet
Mental Floss
If you're a regular Mental Floss reader, you know that we love a good brain teaser. And the one below, which originated on Facebook and has been shared more than 150,000 times, is a great one to test just how sharp you are on a Friday evening at the ...