Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 8)
8.
A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:
Answer: Option
Explanation:
| (A + B)'s 1 day's work = | 1 |
| 10 |
| C's 1 day's work = | 1 |
| 50 |
| (A + B + C)'s 1 day's work = |  |
1 | + | 1 |  |
= | 6 | = | 3 | . .... (i) |
| 10 | 50 | 50 | 25 |
A's 1 day's work = (B + C)'s 1 day's work .... (ii)
| From (i) and (ii), we get: 2 x (A's 1 day's work) = | 3 |
| 25 |
 A's 1 day's work = |
3 | . |
| 50 |
 B's 1 day's work |
|
1 | - | 3 | |
= | 2 | = | 1 | . |
| 10 | 50 | 50 | 25 |
So, B alone could do the work in 25 days.
Discussion:
146 comments Page 11 of 15.
Viknesh said:
7 years ago
Here; C's work A+C = 1/4+1/x = 1/2, 1/4-1/2 =1/4,
B+C 1/3-1/4,
4-3/12 = 12days.
B+C 1/3-1/4,
4-3/12 = 12days.
Sourabh said:
9 years ago
@Awoke.
Your trick is easy to find the solution for these type of question.
Your trick is easy to find the solution for these type of question.
Nitesh Nandwana said:
1 decade ago
@Awoke
Your method is best out of all explanation. Good job, keep it up.
Your method is best out of all explanation. Good job, keep it up.
Alekya said:
7 years ago
@Saurabh.
We get A's rate = 6/2 = 3 units/day.
Here, how it comes 6/2?
We get A's rate = 6/2 = 3 units/day.
Here, how it comes 6/2?
Sumasree said:
1 decade ago
@Rohit nice your answer, but we always follow shortcuts for speed up.
Serina said:
1 decade ago
How did you get 3/25, if you add 1/10 + 1/50 please explain in brief?
Bhaskar said:
7 years ago
a=b+c.
a+b=10,
c=50.
then b+c+b=10.
2b+c=10,
2b=10-50,
2b=40,
b=20.
a+b=10,
c=50.
then b+c+b=10.
2b+c=10,
2b=10-50,
2b=40,
b=20.
ESNALA SIDDA said:
2 months ago
A = B+C.
A + B = 1/10,
2B + C = 1/10,
C = 1/50,
B = 1/25,
B = 25hrs.
A + B = 1/10,
2B + C = 1/10,
C = 1/50,
B = 1/25,
B = 25hrs.
(8)
Shweta said:
6 years ago
Thank you @Sneha you made the given solution easier to understand.
Ananya said:
1 decade ago
2 x (A's 1 day's work) = 3/25.
how this get? pls tell me
how this get? pls tell me
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