- #1

AlexChandler

- 283

- 0

You know that real coins weigh 10 grams, but counterfeit coins weigh 11 grams.

You have an analytical scale that is accurate to .1 gram.

Each stack consists of either all real coins or all counterfeit coins, none of the stacks are mixed.

You do not know how many stacks are counterfeit or even if any of them are.

You want to determine how many stacks are counterfeit (if any),

*and*precisely which ones are.

You want to do this in the

*least possible*amount of weighings.

Whats the fewest number of weighings you need to make?

And how do you do it?