Henry Ernest Dudeney/Puzzles and Curious Problems/29 - The Shopkeeper's Puzzle

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Puzzles and Curious Problems by Henry Ernest Dudeney: $29$

The Shopkeeper's Puzzle
A shopkeeper uses a code word where each letter stands for the digits from $0$ to $9$.
What is the code used to encode this addition sum?
  GAUNT
+ OILER
 ------
 RGUOEI


Click here for solution

Sources