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1.
The different 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 its of that number ?
- A. 4
- B. 4
- C. 4
- D. 4
Answer: Option A
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
Then, (10x + y) - (10y + x) = 36
⇒ 9(x - y) = 36
⇒ x - y = 4
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