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Programming Enigma Puzzles
From New Scientist #1732, 1st September 1990 [link]
In the two division sums below, the six-figure dividend is the same but the divisor and the answer have been interchanged (that is, the first is x ÷ y = z and the second is x ÷ z = y). No digit occurs in both the divisor and the answer, and no digit in the dividend is used in either the divisor or the answer.
What is the dividend?