If `x` is a digit of the number ` 66784 x ` such that it is divisible by 9. find possible values of `x` .

Explanation

If the sum of digits of a number is divisible by `9`, then the number is a multiple of `9`
i.e,`6+6+7+8+4+x=9n`
`=>31+x=9n`
`=>n=4`
`=>31+x=36`
`=>x=5`