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 15 of 23.
Lovely said:
1 decade ago
Why take 1/4 in first step?
Suersh said:
1 decade ago
How 9 3/5?
Adusumalli prasanna said:
1 decade ago
a+b+c=1/4 a's 1st day work = 1/16 b's 1st day work = 1/12.
Therefore c's 1 day work = 1/4-{1/16+1/12) after that 1/4-(12+16/192) {by doing LCM) by dividing 28/192 (by multiplying 2nd table) then we get 1/4-7/48 (by doing LCM).
We get (48-28/192) = 20/192 = 10/96 (dividing with 2 table) we get 5/48. Now please help me why we are taking as 48/5.
Whats the reason explain me clearly please?
Therefore c's 1 day work = 1/4-{1/16+1/12) after that 1/4-(12+16/192) {by doing LCM) by dividing 28/192 (by multiplying 2nd table) then we get 1/4-7/48 (by doing LCM).
We get (48-28/192) = 20/192 = 10/96 (dividing with 2 table) we get 5/48. Now please help me why we are taking as 48/5.
Whats the reason explain me clearly please?
Shivu said:
1 decade ago
Hi thanks all of you solving this problem in easy methods.
Helper said:
1 decade ago
We get 1/x=5/48.
Then we want x. So x=48/5.
Then we want x. So x=48/5.
Bhavana said:
1 decade ago
Firstly take the LCM.
A B ABC.
16 12 4.
LCM IS 48 then ratio is.
A B ABC.
3 4 12.
If a+b-ABC then it's find the value of C = 5 total is 48.
Then divide the 48/5 so simple.
A B ABC.
16 12 4.
LCM IS 48 then ratio is.
A B ABC.
3 4 12.
If a+b-ABC then it's find the value of C = 5 total is 48.
Then divide the 48/5 so simple.
Naresh saini said:
10 years ago
How it is possible to write 5/48 to 48/5?
Khizer said:
10 years ago
= 1/16+1/12+1/C = 1/4.
C = 48/5.
C = 48/5.
Lijin said:
10 years ago
How it possible to write 5/48 to 48/5?
See A can complete a work in n days.
A's 1 day work = 1/n.
So here 1/n = 5/48.
So n = 48/5.
Got it!
See A can complete a work in n days.
A's 1 day work = 1/n.
So here 1/n = 5/48.
So n = 48/5.
Got it!
Tamilmani said:
10 years ago
Please answer sir basic formula applied please.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers