Question

lf 420x is divisible by 3 where x is a digit find all possible value of z?​

Answer 1

If 420x is divisible by 3 then, sum of all digits must be divisible by 3.

so,

4+2+0+x = nearest multiple of 3

6+x = Here nearest multiple of 3 is 6 only

6+x = 6

x = 6-6

x = 0

Therefore the value of x is 0