The difference between a two-digit number and the number obtained by interchanging the digits is 9. What is the difference between the two digits of the number?  Choose the correct choice from the following:  A) 8  B) 2  C) 7  D) Cannot be determined  E) None of these
Suppose the two-digit number be 10x + y.   Then we have been given   l0x + y – (10y + x) = 9   ⇒ 9x – 9y = 9   ⇒ x – y = 1   Hence, the required difference = 1   Note that if the difference between a two-digit number and the number obtained by interchanging the digits is D, then the difference between the two digits of the number = D⁄9   Answer None of these
<result>E</result>
The difference between a two-digit number and the number obtained by interchanging the digits is 9. What is the difference between the two digits of the number?