Work
A Single Weighing
Level 3 · Hard
Ten bags contain coins: all weigh ten grams except every coin in one bag, which weighs nine. An assistant may use a digital scale only once. She samples different quantities from the bags and identifies the unusual one without weighing individual coins separately.
- Choose a narrator: they read the answer privately and hide it.
- Read the premise aloud. Answers: yes, no or irrelevant.
- When the game ends, mark the puzzle as played.
Hold or double tap. With a keyboard, press Enter.