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:
226 comments Page 14 of 23.
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.
Uthappa.U.K said:
1 decade ago
1/4-7/48 cannot be equal to 5/48. Can anyone explain this to me?
Nikita said:
1 decade ago
1/4= 1/12+1/16+1/c
1/4-7/48=1/c
c=9*3/5
1/c= c's one day work
1/4-7/48=1/c
c=9*3/5
1/c= c's one day work
Sana said:
5 years ago
Why the fraction is reciprocated at the end? Explain me, please.
Suresh said:
1 decade ago
LCM of 4 & 48 is 48.
So 1/4-7/48 = (12*1-7*1)/48.
= 5/48.
So 1/4-7/48 = (12*1-7*1)/48.
= 5/48.
Naseer Mohammad said:
1 decade ago
Why you have shown 48/5 instead of 5/48? Any one can help me.
Sonyy said:
1 decade ago
Why you have shown 48/5 instead of 5/48? Anyone can help me.
Lokesh said:
1 decade ago
Why C-A+B?
Therefore C's 1 day's work = (1/4)-(1/16+1/20).
Therefore C's 1 day's work = (1/4)-(1/16+1/20).
Lokesh said:
9 years ago
How is possible at 5/48 write 48/5? please solve it for me.
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