The difference between a two-digit number and the number obtained by interchanging the positions of ...

The difference between a two-digit number and the number obtained by interchanging the positions of its digits is 81. What is the difference between the two digits of that number?

Quiz

Answer/Solution

9

Steps/Work

Sol.
Let the ten’s digit be x and unit’s digit be y,
Then, (10x + y) - (10y + x) = 81 ⇔ 9 (x - y) = 81
⇔ x - y = 9
Answer E

General Calculator / Auto Solver

The difference between a two - digit number and the number obtained by interchanging the positions of its digits is . What is the difference between the two digits of that number?

Calculated Answer

9

Step by Step Solution

In order to solve problem, you must evaluate n0 / (10 - 1).

n0 =81