Aptitude - Problems on Numbers - Discussion
Discussion Forum : Problems on Numbers - General Questions (Q.No. 3)
3.
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?
Answer: Option
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.
Video Explanation: https://youtu.be/7QOJjAmGVx0
Discussion:
59 comments Page 3 of 6.
Bgnr said:
9 years ago
Why we take x and why in addition to 10x and 10y, can anyone explain?
Balaji said:
10 years ago
@Abhijit.
The number your are interchanging is 73 so you have you have to see the difference between 7 and 3 which is equal to 4. And you can check this with the number 84 & 95.
The number your are interchanging is 73 so you have you have to see the difference between 7 and 3 which is equal to 4. And you can check this with the number 84 & 95.
Qasim said:
10 years ago
Why do we interchanging the number?
Nagma jabee said:
10 years ago
Thanks @Nikhilesh and Isran.
Abhijit Kale said:
10 years ago
Guys I agree to your explanation but I found a No. 73. If we reverse it we'll get a no 37. And difference between these two nos is 36.
And difference between digits of this no is 3. All these things matches the criteria of this question except my answer. Please rectify me if I am wrong.
And difference between digits of this no is 3. All these things matches the criteria of this question except my answer. Please rectify me if I am wrong.
Abhijit Kale said:
10 years ago
Guys I agree to this explanation but I found a no which matches the criteria of this question. no is 73. If we reverse is we will get 37.
And difference between 73 and 37 is 36. And difference between digits is 3. Am I wrong?
And difference between 73 and 37 is 36. And difference between digits is 3. Am I wrong?
Bhupathi raj said:
10 years ago
Anymore shortcut. The answer complete only two steps please explain.
Vishal bhosale said:
1 decade ago
Thank you explain it.
Suji said:
1 decade ago
Thank you for explanation.
Abdul kalam said:
1 decade ago
9x - 9y = 36.
x - y = 4.
How did you get 9?
x - y = 4.
How did you get 9?
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