Question

given that the number 663 a 59 is divisible by 9 find all the values that I can have​

Answer 1

Answer:

7

Step-by-step explanation:

When a number is divisible by 9, the sum of its digits is also divisible by 9.

Since 663a59 is divisible by 9

6 + 6 + 3 + a + 5 + 9 is also divisible by 9.

Thus, 29 + a is divisible by 9.

Hence, a can take only one value, which is 7.

This will make the sum 29 + 7 = 36, which is a multiple of 9.