Algebra
posted by Ash .
What is the sum of all possible digits that could fill in the blank
in 47_021 so that the resulting five digit number is divisible by 3?

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im confused on how to go about the problem. that's y i need help on how to start.

4 + 7 + 2 + 1 = 14
What numbers can you put in the blank so that the numbers add up to 15, 18, and 21?
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