if 91z 5 is a multiple of 9 where z is a digit what might be the value of z?

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  1. Do you mean a 4-digit number 91z5?

    The digits of any multiple of 9 add up to a multiple of 9.

    So, 9+1+z+5 = 15+z
    So, z=3 to make the sum 18.

    9135 = 9*1015

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