13:34
Harvard University Interview Tricks | (a,b,c) = ?
18:24
Harvard University Entrance Interview Tricks| Brain Tester Math Problem| Can you solve this problem?
16:23
Germany | A Nice Algebra Problem | Math Olympiad
10:10
Japanese| Nice Algebra Problem| Tricky Maths & Brain Buster Maths| Can you solve this? #matholympiad
10:34