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What is the smallest whole number that is equal to seven times the sum of its digits?

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What is the smallest whole number that is equal to seven times the sum of its digits?
posted Feb 8 by Traina Lyons

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1 Answer

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21


If the number is xy, it can be written as 10x+y
10x+y=7*(x+y) => 3x=6y =>x=2y
The smallest xy is 21

answer Feb 8 by Hanifa Mammadov
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