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

Question

asked Oct 17, 2021 157k views

2 Answers

V H · Answer 1 · 2021-10-22T23:00:45+0000

Answer:

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.