This is an admissions test question from Harvard University dating back to 1869. See if you have what it takes to solve this one! Try it on your own, but stay tuned for Huzefa’s explanation. Check back every Friday for more awesome math puzzles! To learn about math tutoring and standardized test prep, please visit http://www.scalarlearning.com To check out our other math channel, go to http://www.youtube.com/c/scalarlearning