Question

Find all possible values of a for which the 4-digit number 31 a5 is divisible by 3. Also, find the number

Answer 1

1) 3165
2) 3135
3) 3195

Answer 2

a = 0, 3, 6, 9

3105 = 3 + 1 + 0 + 5 = 9

3135 = 3 + 1 + 3 + 5 = 12

3165 = 3 + 1 + 6 + 5 = 15

3195 = 3 + 1 + 9 + 5 = 18