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The Riddle of the Coins

Good morning at Maths at ALC-NYC.  An aspiring Mathematician joined us this morning and has presented us with a riddle…

You have inherited 8 gold coins.  7 of them are real, and one is fake.  The fake coin is lighter than the real ones.  You conveniently have a scale to measure the weight of the coins.  What is the fewest number of times you can use the scale to find the false coin?

Thanks to Max Baranov for sharing this puzzle with us.  Reply with your answers in the comments.

Love and agility,



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