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Q8. 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?

 
  1. (a) 3                
     
  2. (b) 4
     
  3. (c) 9                
     
  4. (d) Cannot be determined
     


Solution

The correct option is B (b) 4
 

(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.

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