Question

. If z806 is a multiple of 9, where z is a digit,
what is the value of z?​

Answer 1

Answer:

31z5 is divisible by 9. ∴ (9 + z) must be equal to 0, or 9 or 18 or 27, ... But z is a digit. ∴ 9 + z = 0 or 9 + z= 18 If 9 + z = 0, then z = 0 and if 9 + z = 18, then z = 9

I hope it is usefull☺️

Answer 2

Answer:

4

Step-by-step explanation:

We know that if the sum of the digits of a number is a multiple of 9 then the number itself is multiple of 9.

So, z + 8 + 0 + 6

= z + 14

Nearest multiple of 9 = 18

So, z = 18 - 14 = 4

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