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If 31z5 is a multiple of 9, where z is ...

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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Given number is 31z5
for `31z5` to be divisible by 9
sum of digit must be equal to `3+1+z+5 = 9,18`
`9+z=9`
`z=0`
...
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