Question

one number exceeds The Other by 9 and their sum is 81

Answer 1

let the numbers be :x, x+9
x+x+9=81
2x+9=81
2x=81-9
2x=72
x=72/2
x=36
and
x+9= 36+9=45
this numbers are 36 and 45

Answer 2

let the 1 no. ne X and other be Y
so. according. to the condition :
X-Y=9
given;X+Y=81
now add both the equation and by adding the Y terms cut out so resultant will be ;
2X=81+9
2X=90
X =45
put the value in equation
45-Y=9
Y=45-9
Y=36