Question

The sum of the digits of a two digit number is 9 if 27 is added

Answer 1

Let the no. be xy where x and y are digits

Given x+y=9 then sum of the digits of xy+ 27

The no. xy can be written as 10x+y

The resulting no. Is 10x+y+20 +7

10(x+2)+y+7

10 should be removed as the question is sum of digits

(x+y)+2+7

9+2+7

9+9

18 is the ans