Question

3. A number consist of 2 digits whose sum is 9.
It 27 is subtracted from the number it's digit are
reversed. Find the number.
​

Answer 1

Step-by-step explanation:

let the unit digit be x

then the tens digit will be 9-x

number obtained = 10(9-x)+x

= 90-9x

now according to question

(90-9x) - 27 = reversed number

90-27-9x = 10x+(9-x)

63-9x = 9x+9

9x + 9x = 63-9

18x = 54

x = 3

Required Number = 90-9×3

= 63