Question

sum of the digits is 9. the number obtained by interchange the digits exceed the given numbers by 27. find the number

Answer 1

let the number be x

x+ 27=9

x=27-9

x=18

the number is 18

Answer 2

hey mate here is your answer

let the tens place be y and ones place be x

x + y = 9 .....1

10x + y = 10y + x + 27

9x - 9y = 27

x - y = 3

by elimination method

x + y = 9

x - y = 3

2x =12

x =6

x+y = 9

6+y =9

y=3

(you can also use substitution method )