Question

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 digit of that number ?

• A. 3
• B. 4
• C. 9
• D. Cannot be determined
• E. None of these

Answer 1

The correct option is B 4

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

Then, $(10x+y)-(10y+x)=36$

$9(x-y)=36$

$x-y=4$

Therefore, the difference between the two digit of that number is $4$