Solve percentage calculations more easily with this simple math technique for getting quick and accurate results.

A seemingly easy math puzzle making the rounds on the internet has left people scratching their heads as it requires some clever thinking. The brainteaser, that was shared on X this week by user ...

is a math professor at Harvey Mudd College, but he's got a side gig, too: as a magician. His new book, "The Magic of Math," combines his two passions — which actually have a lot in common.