Quite a few of my class know the answer to 'Who Keeps the Fish?' know.
This problem is ascribed to Einstein who reckoned that only the top 2% of the population could solve it. That might have been true back then, but I reckon we're a lot more adept as problem solving these days. Anyway, I was really impressed with Lauren's neat, tabulated solution to the problem. See if you can work out how she did it.