Henry Ernest Dudeney/Puzzles and Curious Problems/34 - The Banker and the Note/Solution

by : $34$

 * The Banker and the Note

Solution
Because the identical forged banknote can be traced through all the transactions, all of them are invalid.

Therefore everybody stands in relation to their debtor exactly as they were before the banker picked up the note.

All, that is, except the butcher owes $\pounds 5$ to the farmer for the calf received.