The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 27. What is the difference between the two digits of that number?	Options:	A) 3	B) 5	C) 6	D) 8	E) 9
Sol.   Let the ten’s digit be x and unit’s digit be y,   Then, (10x + y) - (10y + x) = 27 ⇔ 9 (x - y) = 27   ⇔ x - y = 3   3nswer 3
<result>A</result>
The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 27. What is the difference between the two digits of that number?