Question

if x is a digit such that 67x51 is divisible by 9 find the possible values of x

Answer 1

Answer:

67x51 is divisible by 9 if it's digital sum is divisible by 9.

» 6 + 7 + x + 5 + 1

= 19 + x

= 1 + x

Therefore, 1 + x is divisible by 9.

Also, x € [0, 9]

Since, 1 + 8 is divisible by 9.

Therefore, the value of x is 8.