Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 9)
9.
A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?
23 days
37 days
37
40 days
Answer: Option
Explanation:
| Whole work is done by A in |  |
20 x | 5 |  |
= 25 days. |
| 4 |
| Now, | |
1 - | 4 | |
i.e., | 1 | work is done by A and B in 3 days. |
| 5 | 5 |
Whole work will be done by A and B in (3 x 5) = 15 days.
| A's 1 day's work = | 1 | , (A + B)'s 1 day's work = | 1 | . |
| 25 | 15 |
 B's 1 day's work = |
|
1 | - | 1 | |
= | 4 | = | 2 | . |
| 15 | 25 | 150 | 75 |
| So, B alone would do the work in | 75 | = 37 | 1 | days. |
| 2 | 2 |
Discussion:
164 comments Page 12 of 17.
Rajkanya Saha said:
9 years ago
Too good @Baskar.
Thanks for explaining the answer.
Thanks for explaining the answer.
Pratswinz said:
1 decade ago
@Bhaskar your explanation was superb. Carry on dude.
(1)
Shivaram goud said:
1 decade ago
@Snehagoud.
Can you check the what is 80/100 = 5/4?
Can you check the what is 80/100 = 5/4?
Joy khwaka said:
2 years ago
Finally, I understood the concept, Thanks @Rajendra.
(4)
Anitha said:
3 years ago
Your explanation is short and good.
Thanks @Ajith.
Thanks @Ajith.
Kajal said:
3 years ago
@Baskar.
Thank you very much for your explanation.
Thank you very much for your explanation.
(2)
Nanny said:
1 decade ago
Thank you bhaskar, you done great job, keep it up.
Asma said:
9 years ago
Can anyone say why we are multiplying 20 with 5/4?
Gowtham said:
8 years ago
80/100 is 4/5 then how you get it as (20*5/4) =25?
Sanjeev pandey said:
1 decade ago
23(1/25) + 3(1/B) = 1 .....(1).
B = 75/2 Days.
B = 75/2 Days.
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