Number System Practice Test 3

If a number is divisible by 6, then it must also be divisible by 2 and 3.
So, y must be 0, 2, 4, 6 or 8,
but y - x = 1.
So, y must be greater than 0 and 2.
Now, y can be 4, 6 or 8.
If y = 4 then x = 3.
If y = 6 then x = 5.
If y = 8 then x = 7.
Now, the sum of digits of the number must also be divisible by 3.
From the option, only y = 4 and x = 3 is divisible by 6.
So, this is the correct pair.