The difference between a two-digit number and the number after interchanging the position of the two digits is 63. What is the difference between the two digits of the number?  Choices
A) 4  B) 7  C) 3  D) Cannot be determined  E) None of these
Let the two-digit no. be l0x + y.   Then, (10x + y) â€“ (10y + x) = 63   or, 9(x â€“ y) = 63   or, x â€“ y = 7   Answer 7
<result>B</result>
The difference between a two-digit number and the number after interchanging the position of the two digits is 63. What is the difference between the two digits of the number?