Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 26)
26.
The difference between a positive proper fraction and its reciprocal is 9/20. The fraction is:
Answer: Option
Explanation:
| Let the required fraction be x. Then | 1 | - x = | 9 |
| x | 20 |
 |
1 - x2 | = | 9 |
| x | 20 |
20 - 20x2 = 9x
20x2 + 9x - 20 = 0
20x2 + 25x - 16x - 20 = 0
5x(4x + 5) - 4(4x + 5) = 0
(4x + 5)(5x - 4) = 0
| x = | 4 |
| 5 |
Discussion:
53 comments Page 5 of 6.
Rima said:
1 decade ago
Can anyone tell me what is meaning of "positive proper fraction"?
Md Kashif said:
9 years ago
It should be x - 1/x = 9/20. Thus, x would come out to be 5/4.
Suresh said:
7 years ago
What is factorization? I am not understanding this.
Vicky said:
7 years ago
I think the right answer is 5/4.
Ref: RS Agarwal.
Ref: RS Agarwal.
(1)
Rafi said:
1 decade ago
Please explain how it become (5x-4) (4x+5) = 0?
Puja said:
6 years ago
Can anyone please explain how 25 and 9 came?
Nikita said:
9 years ago
Very nice explanation, thank you all.
Karthik said:
5 years ago
Please anyone explain me in detail.
Shanu said:
5 years ago
Why 1-x^2/x? Please explain it.
(1)
Dharna said:
7 years ago
Answer should be 5/4 not 4/5.
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