Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 1)
1.
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :
Answer: Option
Explanation:
| A's 1 day's work = | 1 | ; |
| 15 |
| B's 1 day's work = | 1 | ; |
| 20 |
| (A + B)'s 1 day's work = |  |
1 | + | 1 |  |
= | 7 | . |
| 15 | 20 | 60 |
| (A + B)'s 4 day's work = | |
7 | x 4 | |
= | 7 | . |
| 60 | 15 |
| Therefore, Remaining work = | |
1 - | 7 | |
= | 8 | . |
| 15 | 15 |
Discussion:
351 comments Page 23 of 36.
Sagar said:
2 decades ago
@deepa
lcm of 15 and 20 is 60 so we get 7/60
understood
lcm of 15 and 20 is 60 so we get 7/60
understood
Prem said:
1 decade ago
7/60 = 20+15/300. But I am not understanding last step.
Jenifer said:
9 years ago
@Shubam Mishra.
Because 60 is just the value of L.C.M.
Because 60 is just the value of L.C.M.
Hari said:
2 years ago
@Vishnu.
Can you explain the process in detail please?
Can you explain the process in detail please?
(15)
Merlin said:
1 decade ago
Why do we make an assumption that the total work is 1?
Sushmoy said:
1 decade ago
(1-8/15) = 7/15 how is it possible? Please explain me.
Sushant said:
1 decade ago
How 7/60 come?
How to solve 1/15 + 1/20? Explain me.
How to solve 1/15 + 1/20? Explain me.
Yona said:
9 years ago
According to me,
=(4/15+4/20),
=(140/300),
=(7/15).
=(4/15+4/20),
=(140/300),
=(7/15).
SkiGi said:
5 years ago
Why 7/60? I don't understand, please someone explain.
Trupti said:
1 decade ago
1-7/15 should be 6/15 please explaine how 8/15......
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