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The difference between a two- digit number and the number obtained by interchanging the position of its digits is 36.What is the difference between the two digits of that number ?
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- 3
- 4
- 9
- Cannot be determined
Correct Option: B
Let the ten's digits be x and unit's digit be y.
Then,(10x + y) - (10y + x)=36 ⇔9(x-y)=36
⇔ x - y=4
