Medium
Interview Riddles
24 XP

The Scale of the Universe

24,788 solved 46% solve rate 54% fail rate
How many piano tuners are in Chicago? (Fermi estimation)
Only 46% solve this correctly
24,788 attempts
Earn +24 XP for solving
Quick Answer & Explanation
60 tuners

The answer to this riddle is 60 tuners. Difficulty: Medium ยท Solved by 24,788 puzzle lovers.

With ~300k households, roughly 10% own pianos (30,000 pianos tuned twice/year = 60,000 tunings). One tuner completes ~1,000 tunings/year, yielding approximately 60 tuners.
โ† The Pirate Division The Water Gallon Problem โ†’
๐Ÿง  Play Today's Riddle