Suppose that you have 10 piles of coins. Each pile has exactly 10 coins. Eight piles consist of normal coins, which weight 100g each, and the remaining two piles consist of fake coins, each of which is heavier than 100 g. All the fake coins have identical (and unknown) weight.

You are given a digital scale, which can take any number of coins and return the total weight. Please identify the 2 piles with fake coins in only 2 weighings.

EDIT: I apologize for the double post. I have no idea why this puzzle shows up twice as two topics. If any mod sees this, please delete this duplicate topic.

## Question

## bushindo 14

Suppose that you have 10 piles of coins. Each pile has exactly 10 coins. Eight piles consist of normal coins, which weight 100g each, and the remaining two piles consist of fake coins, each of which is heavier than 100 g. All the fake coins have identical (and unknown) weight.

You are given a digital scale, which can take any number of coins and return the total weight. Please identify the 2 piles with fake coins in only

2weighings.EDIT: I apologize for the double post. I have no idea why this puzzle shows up twice as two topics. If any mod sees this, please delete this duplicate topic.

Edited by bushindo## Link to post

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