Question

the sum of the digit of a 2 digit numbers is 9.one reverseing digit the new number formed is less than the original number by 9 find the original number​

Answer 1

Step-by-step explanation:

let two digit number is= 10x+y

x+y=9.........I

10y+x=10x+y -9

10y+x -10x-y=9

9y-9x=9

y-x=1

x+y=9

_____

2y=10

y=5

x=4

number is 10×4+5=45