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Jerry Krinock · Answer 1 · 2017-03-21T13:14:59+0000

If the number is divisible evenly by 9, the sum of its digits must be divisible by 9.
2+5+3+0=10
What single digit can you add to 10 to get a number divisible by 9?

Just 8. Only 8 would work. It would make 18, and 18 is divisible by 9.

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