Question

solve the question of the pic

Answer 1

Let the number be x
(x+y)=9
Number=10(x)+y
ATQ,
10x+y-9=10y+x
10x-x+y-10y=9
9x-9y=9
9(x-y)=9
x-y=1
After equating,
x+y=9
x-y=1
----------
2x=10
x=5
y=4

So,Number=10(5)+4=54@