A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by:  Pick:
A) 3  B) 5  C) 9  D) 11  E) None of these
Let the ten's digit be x and unit's digit be y.   Then, number = 10x + y.   Number obtained by interchanging the digits = 10y + x.   (10x + y) + (10y + x) = 11(x + y), which is divisible by 11.   ANSWER : 11
<result>D</result>
A number consists of two digits. If the digits interchange places and the new number is added to the original number, then the resulting number will be divisible by: