Question

the sum of digits of two digit number iss 7.If we add 45 to the no.,the digits are interchanged.Find the no.

Answer 1

let the two digit no. be x.+ y =7
and xy+45=yx and only pairs possible in this are 1+6,2+5,3+4+3and5+2
so the no. is 16
as 16+45=61
hope it helps..