Riddle: One-fourth of the population of a newly discovered planet has 4 legs while the rest have two legs. There are 60 legs in total. What is the population of the newly discovered planet?
Answer: 4 + 2 + 2 + 2 = 10 legs and 4 inhabitants. Repeat this six times to use up all 60 legs and you end up with 24 total inhabitants.