Twenty years ago, this puzzle appeared on a test administered to top-tier math students from 16 countries around the world. Only 10% of test takers got it right. In the U.S., only 4% managed to ...

Are you ready for this math riddle test? Okay, in today’s math riddle, a series of numbers is used as logical reasoning to test your mental ability. So, can you prove you're in the 1% league with an ...