Question

Which of the following number is 9 times the sum of its digit​

Answer 1

9 x 9 = 81










Srry if im wrong

Answer 2

81

Explanation:

9*(x + y) = 10x + y

9x + 9y = 10x + y

0 = x - 8y

8y = x

=======

y = 1

x = 8

x + y = 8 + 1 = 9

9*9 = 81

So 81 is 9 times the sum of it's digits.