Numbers Q14

14.	The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 36. What is the difference between the two digits of that number?
	A. 3 B. 4 C. 9 D. Cannot be determined E. None of these

Answer: Option B

Explanation:

Let the ten's digit be x and unit's digit be y.

Then, (10x + y) - (10y + x) = 36

 9(x - y) = 36

                     x - y = 4.