Question

A no consist of two digit whose sum is 8 of 18 is added to the no then its digit are interchange find the no

Answer 1

number be xy
x+y=8 let it be eqn1
10x+y+18=10y+x
9x-9y+18=0
x-y=-2 let it be eqn 2

so from eqn 1 and 2,
2x=6
x=3
so y=8-3=5

therefore
the number is 35

Answer 2

The no.is 35.beliw is the explanation