Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 2)
2.
A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:
Answer: Option
Explanation:
| (A + B + C)'s 1 day's work = | 1 | , |
| 4 |
| A's 1 day's work = | 1 | , |
| 16 |
| B's 1 day's work = | 1 | . |
| 12 |
 C's 1 day's work = |
1 | - |  |
1 | + | 1 |  |
= | |
1 | - | 7 | |
= | 5 | . |
| 4 | 16 | 12 | 4 | 48 | 48 |
| So, C alone can do the work in | 48 | = 9 | 3 | days. |
| 5 | 5 |
Discussion:
224 comments Page 13 of 23.
Twinkle said:
1 decade ago
A+B+C=1/4.
[1/16]+[1/12]+C=[1/4].
C=0.1041.
THEREFORE, 1/0.1041=48/5.
i.e: 9*3/5.
[1/16]+[1/12]+C=[1/4].
C=0.1041.
THEREFORE, 1/0.1041=48/5.
i.e: 9*3/5.
Ashim Ray said:
1 decade ago
Why you have shown in the last fraction 48/5 in where the result has come out 5/48?
Shafiyulla said:
8 years ago
Solve my doubt, please.
A+b+c=1/4 correct.
Then how C' s one day work became 1/4?
A+b+c=1/4 correct.
Then how C' s one day work became 1/4?
Kishore said:
1 decade ago
How can we know the that C can do full in (1/how much work 'C ' done in one day) ?
Dumpati Mahesh said:
1 decade ago
@Anusha,
For getting one day work it should be reversed. i.e. 1/(5/48) = 48/5.
For getting one day work it should be reversed. i.e. 1/(5/48) = 48/5.
Mathivanan said:
10 years ago
Awesome answers the way of explaining is very excellent. Thank you all of you.
Sasi said:
8 years ago
A+b+c-(a+b)=1/4-1/16-1/12=1/4(1/1-1/4-1/3).
4*4**3=48.
=>12-7/48=5/48.
4*4**3=48.
=>12-7/48=5/48.
Shalu said:
1 decade ago
@Aparna
Why you substracted 1/4 -7/48 why dont you add 1/4+7/48 ?
Why you substracted 1/4 -7/48 why dont you add 1/4+7/48 ?
Nalini said:
1 decade ago
@reema
take lcm of 1/4 - 7/48
i..e
12-7/48
= 5/48:)
got it??
take lcm of 1/4 - 7/48
i..e
12-7/48
= 5/48:)
got it??
Kalai said:
1 decade ago
I can't understand how 5/48 becomes 48/5. Can you clarify for me.
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