Aptitude - Problems on Numbers - Discussion
Discussion Forum : Problems on Numbers - Data Sufficiency 2 (Q.No. 2)
Directions to Solve
Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.
2.
What is the two-digit number? | |
I. | Sum of the digits is 7. |
II. | Difference between the number and the number obtained by interchanging the digits is 9. |
III. | Digit in the ten's place is bigger than the digit in the unit's place by 1. |
Answer: Option
Explanation:
Let the tens and units digit be x and y respectively.
I. x + y = 7.
II. (10x + y) - (10y + x) = 9 
x - y = 1.
III. x - y = 1.
Thus, I and II as well as I and III give the answer.
Correct answer is (E).
Discussion:
26 comments Page 2 of 3.
Gaurav Goyal said:
1 decade ago
I believe E is correct.
Either we can obtain the answer from 1 & 3 or from 1, 2 and 3.
Either we can obtain the answer from 1 & 3 or from 1, 2 and 3.
Anbumani said:
3 months ago
I. x + y = 7.
III. x - y = 1.
By Adding I and III,
Then 2x = 8 => x = 4,
And y = 3.
III. x - y = 1.
By Adding I and III,
Then 2x = 8 => x = 4,
And y = 3.
Anurag said:
1 decade ago
I think option (c) or even (a) is correct because I'm getting just "43" as answer.
Abirami said:
2 years ago
Can anyone explain the second statement, how do we get 9? Please explain to me.
Amit Mandliya said:
1 decade ago
C should be the answer. As I & III are providing required information.
V.Keerthana said:
1 decade ago
May be C correct answer because it provides only required information.
Arjun said:
1 decade ago
I think answer will be D for sure. There is no discussion in that.
Sumanth Nakirikanti said:
1 year ago
If both options A and C are correct why would you mark option E.
Charanya said:
7 years ago
I think its option A. We get answer by I and II only.
Rutuja kapadnis said:
8 years ago
Answer is E.
Eg. 99 (99-99)=0 nd 9=9.
Eg. 99 (99-99)=0 nd 9=9.
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