Civil Engineering Mechanical Engineering Chemical Engineering Networking Database Questions Computer Science Basic Electronics Digital Electronics Electronic Devices Circuit Simulation Electrical Enigneering Engineering Mechanics Technical Drawing

# Aptitude - Problems on Numbers - Discussion

@ : Home > Aptitude > Problems on Numbers > General Questions - Discussion

### Read more:

"Everyone is wise until he speaks."
- (Proverb)
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?

 [A]. 69 [B]. 78 [C]. 96 [D]. Cannot be determined [E]. None of these

Answer: Option B

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.

 Dominic said: (Fri, Jul 29, 2011 03:32:42 PM) If we take 69 as answer. Sum becomes:6+9=15. But difference become: 6-9=-3. But from the question, the sum should be 15 and the difference 3, not -3. On this note, I strongly believe that, the correct answer is 96, because. Sum: 9+6=15, And difference: 9-6=3.

 Sundar said: (Wed, Jun 13, 2012 01:03:57 PM) @Dominic You are wrong. The given answer is correct. I want to ask a question to you. Assume your height is 165 cm and your friend's height is 170 cm. Now tell me what is the height-difference between you and your friend? Is it 5 cm or -5cm ? We usually write difference between x and y as X ~ Y NOT as X - Y. Hence the given answer 'Cannot be determined' is correct.

 Ramesh said: (Wed, Jun 13, 2012 01:08:11 PM) I agree with Sundar.

 Moola V Reddy said: (Tue, Jun 26, 2012 07:12:08 AM) I agree with Dominic always read the question carefully 1.sum of the two digits 2.difference between them sundar said good example of difference but there is no sum

 Sally said: (Sun, Mar 10, 2013 11:56:38 PM) 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?

 Write your comments here: ...

© 2008-2013 by IndiaBIX™ Technologies. All Rights Reserved | Copyright | Terms of Use & Privacy Policy

Contact us: info@indiabix.com     Follow us on twitter!