There are nine silver coins marked 1, 2, 3, 4, 5, 6, 7, 8, and 9.
They are supposed to weigh the number of grams that is written on them.
One of the coins is fake and is lighter than it should be.

Find the fake coin using the balance scale twice.

(In reply to re: Two preplanned weighings by Steve Herman)

Thanks for catching that. Another day, another typo!

Posted by Brian Smith on 2016-01-19 10:04:00