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If 31z5 is a multiple of 9, where z is a digit, what is the va
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If 31z5 is a multiple of 9, where z is a digit, what is the value of z?You will find that there are two answers for the last problem. Why is this so?

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Question Text
If 31z5 is a multiple of 9, where z is a digit, what is the value of z?You will find that there are two answers for the last problem. Why is this so?