Question

if 31z6 is a multiple of 9 then the value of z is

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Answer 1

Answer:

z=8

Step-by-step explanation:

3+1+z+6 is divisible by 9

then 10+z

if it divisible by 9 put z=8

Answer 2

Answer:

Since the number 31z5 is a multiple of 9, the sum of its digits 3+1+z+5=9+z is a multiple of 9.

∴(9+z) is either 0 or 9 or 18 or 27...

Since z is a non zero digit, so (9+z) must be equal to 18.

i.e., 9+z=9⇒z=0

OR 9+z=18⇒z=9

Step-by-step explanation: