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Puzzle ZQIZ 


?

Can you find a five-digit number …

… whose digits add up to 18 and whose product is 210 and the digits increase from left to right in the number?

Puzzle Copyright © Kevin Stone

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Answer
12357.

Reasoning
Since 210 = 2 x 3 x 5 x 7, 12357 is the only way to get a 5-digit number, in ascending order.