So f = 1, making c = 5. If a = 4, then e = 7. Our solution is {4, 5, 7, 1}. Why is this system so hard to solve by traditional algebra? It's because these aren't simple linear equations. As soon ...

10. True Blue This logic puzzle for adults will stump even the most astute solvers! Daniel, Emily, Marciano, and Christina are all wearing solid-colored shirts. Their shirts are red, yellow, green ...

The Mind Your Decisions YouTube channel offers up a thorny math problem designed for 9-year-olds (!). Our solution involves narrowing down the possibilities using the logic of puzzle solving.