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The five-digit number 31d26

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is divisible by 3. Find the sum of
all possible values of d.

2 answers

I would insert values 0-9 and divide by three, adding those numbers that give whole number answers.

31026/3 = 10342 (That's one.)

d must be divisible by 3, it must be 0,3,6,9 the sum is 18

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