I have four legs in the morning, two legs at noon, and three legs in the evening, yet my total number of legs is always prime. What am I?
A time traveler
A classic riddle twist: Sphinx stages have 4, 2, 3 legs. 4+2+3 = 9 (not prime). Wait, let's make a strict math one: I am a creature whose leg count equals the square root of 81 minus 6.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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