Question

a no. has two digits whose sum is 8 if the no.18 is added to first no.,its digits are reversed find other no.

Answer 1

Let digits be x and y
Number = 10x+y
Reversed Number = 10y+x
As per ques.
x+y = 8 --- (i)
10x+y +18 = 10y+x
=> 9x-9y = -18
=> x-y = -2 ----(ii)
Adding (i) and (ii)
2x =6
x=3
so y =5
so number is 35