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This puzzle was published by the prolific Henry Dudeney in the July 1924 issue of Strand magazine. The object is to find a single digit for each letter in the puzzle to make the sum correct. Each letter must stand for a different digit and the same digit must be used for a given letter throughout the puzzle. The leading digits cannot be zero.

   S E N D
 + M O R E
 M O N E Y

Source: Henry Dudeney, Strand Magazine, July, 1924