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March 28, 2017

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The five-digit number 31d26
-----
is divisible by 3. Find the sum of
all possible values of d.

  • Algebra - ,

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

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

  • Algebra - ,

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

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