Find all digits x such that the number 4×7 is divisible by 3. Select all that apply.
Note
A number is divisible by 3 if the sum of its digits is divisible by 3; 4 + x + 7 = 11 + x must be divisible by 3, so x = 1, 4, or 7 make the sum 12, 15, or 18 respectively.