x + 9
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The greatest 3-digit number is 999. 9+9+9 = 27 The sum of the greatest 3-digit number is 27.
If the digit sum of a number is 9 then it is divisible by 9
The number is 45. The sum of its digits i.e. 4+5=9 Five times the sum of its digits i.e. 5 times 9 which is 45
Yes it is. In order for it to be divisible by 9, the sum of the digits in the number must also be divisible by 9. In this case - the sum of the digits is 27.
81 8+1=9 9*9=81