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.
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?
Bhupathi raj said:
10 years ago
Anymore shortcut. The answer complete only two steps please explain.
Banasree Debbarma said:
9 years ago
How does 10x, y, 36 come?
Lakshmi g said:
9 years ago
Why we take 10 or something digit? They are no mention anything they are mention only 36 find only that one why we take.
Dennis joel said:
9 years ago
Do we have formulae for calculating this? Please tell me.
Daddi said:
9 years ago
Yes we have a separate formula for this type of problems.
Difference between two digits of two digit number is = (Difference in original and interchanged number)/ 9.
Difference between two digits of two digit number is = (Difference in original and interchanged number)/ 9.
Vidhya said:
8 years ago
Instead of 10 can we take anyother number to get the actual answer?
Bhola nath mahakur said:
8 years ago
Thanks for the explanation.
Deepak Rawat said:
8 years ago
We cannot take : (10x+y)-(10y+x)=36 because if x or y = 0 then may it come under one digit number.
So,
let take : ((10x+10)+y)- ((10y+10)+x)=36 in this way if we put x or y 0. It give result two digit number.
So,
let take : ((10x+10)+y)- ((10y+10)+x)=36 in this way if we put x or y 0. It give result two digit number.
Shreya said:
7 years ago
Thanks for the explantion.
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