Question

3. If 31z5 is a multiple of where Z is a digit. What be the values of Z?​

Answer 1

Answer:

Now, as z is a single digit, the value of z will be from 0−9. Now, we add the all possible values to the sum of digits and observe the sum that for which digit the sum is divisible by 3. Now, from obtained sum of digits only 9,12,15,18 are divisible by 3. So, the possible values of z are 0,3,6,9.