Find all possible values of x for which the 4-digit number 320x is divisible by 3. Also, find the numbers.
If a number is divisible by 3, then the sum of the digits is also divisible by 3.
$3+2+0+x=5+x$ must be divisible by 3 .
This is possible in the following cases:
Thus, the number is 3201 .
Thus, the number is 3204 .
Thus, the number is 3207 .