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This alphametic, created by Henry E. Dudeney, is somewhat of a classic. Substitute a single digit for each letter such that the equation is true. No number will begin with a zero.

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

+

S becomes: E becomes: N becomes: D becomes: M becomes: O becomes: R becomes: Y becomes:

Other puzzles by Dudeney: The Crossword Clown, Christmas Shopping.
Other alphametic puzzles: Alphametic puzzle #2 (FORTY + TEN + TEN = SIXTY), Alphametic puzzle #3 (DONALD + GERALD = ROBERT).