Question

sum of two digits of two digit number is 9. when the digits are reversed the difference between new and original number is 9 . find the original number.​

Answer 1

$\huge\boxed{\fcolorbox{cyan}{blue}{Solution }}$

Sum of the digits of a 2-digit number is 9. When the digits are reversed, it is found that the resulting number is greater then the original number by 27. ... Therefore, number is 10y+x.