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Coins Puzzle

Mrs Hannah Jones

Created on April 15, 2022

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Transcript

Instructions
There are 9 coins, all except one are the same weight, the odd one is heavier than the rest. You must determine which is the odd one out using two scales. You may check the weight twice. Explain how this can be done.
Instructions
There are 9 coins, all except one are the same weight, the odd one is heavier than the rest. You must determine which is the odd one out using two scales. You may check the weight twice. Explain how this can be done.

%[4000]

%[5000]

Weigh 1

*C2

*C1

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*1

Instructions
There are 9 coins, all except one are the same weight, the odd one is heavier than the rest. You must determine which is the odd one out using two scales. You may check the weight twice. Explain how this can be done.

%[4000]

%[5000]

Weigh 2

*C1

*C2

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*0.5

*1

Not this time...

Instructions
There are 9 coins, all except one are the same weight, the odd one is heavier than the rest. You must determine which is the odd one out using an old fashioned balance. You may use the balance twice. Explain how this can be done.
Put heavy coin here

Final Check

Now decide...