Question

the sum of digits f a two digit number is 9.also nine times this number is twice the number obtained by reversing the order of digit. find the number

Answer 1

let tens digit no.be X and unit digit no.be Y
A/q
x+y=9
and 9 (10×x+y)=2 (10×y+x)
90x+9y=20y+2x
88x-11y=0
from 1st
11x+11y=99
88x-11y=0
......
99x=99
x=1
and y=8 hence the no.is 18

Answer 2

Answer:

11x +11y=99 from where