Suppose a number 381A is divisible by 9, then what is the value of A?

A number is divisible by 9 if the sum of its digits is divisible by 9, e.g., 117. So, we have the number 381A. Hence, 3 + 8 + 1 + A = multiple of 9 If we put A = 6, then we get 3 + 8 + 1 + 6 = 18 (which is a multiple of 9)