Question

the sum of the digit of a two digit number is 10.if 18 be substracted from it the digit in the resulting number will be equal.the number is

Answer 1

the two digit number--> _ _
                   _+_=10
 let the two digit number be 'a'
                   a-18=10
                        a=10+18
                        a=28
therefore, the number is 28

Answer 2

number is 9 and 1 (9+1 =10, 18-9=9).