Question

The sum of the digits of a two-digit number is 7. The number formed by reversing the digits is 45 more than
the original number find the original number.
... of the digite of a two-digit number is 9 Tf 9 is added to the number the digits interchange their​

Answer 1

Answer:

let the no. be =x

and other no. be=9-x

the no. is 10x+9-x

according to question we should add 9

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

9x+18=90-9x

18x=90-18

x=72÷18

x=4