Question

(b) If 3125 is a multiple of 3, where z is a digil, what might be the values of Z?​

Answer 1

QUESTION :  

If 31z5 is a multiple of 3, where z is a digit,

what might be the values of Z?​

Answer:

0,3,6 or 9

Step-by-step explanation:

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

Hence 9+z is a multiple of 3

Since z is a single digit which can value from 0−9,

Possible values of z will be,

9+0=9

9+3=12

9+6=15

9+9=18

Thus, there can be four possible values i.e. 0,3,6 or 9

Answer 2

Answer:

sum of numbers should be multiple of 3

3+1+5+z

9+z

value of z can be 0,3,6,9.