IndiaBIX

Aptitude - Problems on Numbers - Discussion

Discussion Forum : Problems on Numbers - General Questions (Q.No. 6)
Problems on Numbers
6.
The sum of the digits of a two-digit number is 15 and the difference between the digits is 3. What is the two-digit number?
69
78
96
Cannot be determined
None of these
Answer: Option
Explanation:

Let the ten's digit be x and unit's digit be y.

Then, x + y = 15 and x - y = 3   or   y - x = 3.

Solving x + y = 15   and   x - y = 3, we get: x = 9, y = 6.

Solving x + y = 15   and   y - x = 3, we get: x = 6, y = 9.

So, the number is either 96 or 69.

Hence, the number cannot be determined.

Discussion:
40 comments Page 3 of 4.
S Vishnu Vardhan said:   1 decade ago
Could somebody explain why we are not taking the tens digit as 10x and the ones digit as y, Like it was done in the previous questions?
Sally said:   1 decade ago
Could somebody explain why we are not taking the tens digit as 10x and the ones digit as y, Like it was done in the previous questions?
Ajay said:   1 decade ago
Please explain why we are not taking the tens digit as 10x and the ones digit as y, Like it was done in the previous questions?
Balu said:   1 decade ago
Please why we not take tens digit as 10x and unit digit as y. Please explain as it taken in previous question.
Amit said:   6 months ago
It should be 96 as 9 + 6 = 15 and 9 - 6 = 3. It satisfies the given condition.

Correct me, if I am wrong.
(7)
Jambay said:   5 years ago
The answer will be 96 only as question specify that x-y as 3 not -3.

So the answer is 96 only.
(16)
Marvellous David said:   5 years ago
I don't understand where they got that x=6 and y=9. Please anyone explain me.
(1)
Naina said:   8 years ago
Hi,

Can anyone explain, why we didn't take (10x+y) and (10x-y)?
Devi said:   9 years ago
Please, anyone tell me the correct answer to this problem.
Pooja P Kumar said:   8 years ago
I Strongly agree @Sundar. That's absolutely correct.
Post your comments here:

Your comments will be displayed after verification.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers