Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 3)
3.
A, B and C can do a piece of work in 20, 30 and 60 days respectively. In how many days can A do the work if he is assisted by B and C on every third day?
Answer: Option
Explanation:
| A's 2 day's work = |  |
1 | x 2 |  |
= | 1 | . |
| 20 | 10 |
| (A + B + C)'s 1 day's work = | |
1 | + | 1 | + | 1 | |
= | 6 | = | 1 | . |
| 20 | 30 | 60 | 60 | 10 |
| Work done in 3 days = | |
1 | + | 1 | |
= | 1 | . |
| 10 | 10 | 5 |
| Now, | 1 | work is done in 3 days. |
| 5 |
Whole work will be done in (3 x 5) = 15 days.
Discussion:
357 comments Page 20 of 36.
Abdul moeed said:
5 years ago
Use unity rule at the last step,
1/5 work is done in = 3 days.
1 work (whole work) is done in = 3/1/5 = 3*5= 15 days.
1/5 work is done in = 3 days.
1 work (whole work) is done in = 3/1/5 = 3*5= 15 days.
GOURAB said:
6 years ago
In 3 days ,the total work = 3/20 + 1/30 + 1/60 = 1/5.
1/5 % done in 3 days.
1% done in 3/(1/5) = 3 * 5 = 15 days.
1/5 % done in 3 days.
1% done in 3/(1/5) = 3 * 5 = 15 days.
Abhishek Rajput said:
8 years ago
solve :: x * (1/20)+x/3*(1/30+1/60) = 1 for x, where x is number of days A worked.
Please, anyone solve this.
Please, anyone solve this.
Sushant said:
1 decade ago
(A + B + C)'s 1 day's work = 1 + 1 + 1 = 6 = 1 .
20 30 60 60 10
how did we get 60
20 30 60 60 10
how did we get 60
Karan Singh said:
1 decade ago
Is Vijay's formuala correct? In real aptitude test, the quick formula will be handy and faster to calculate.
Emmanuel said:
1 decade ago
Can someone help me out? why are they multiplying 3 and 5 but not any number for example 3 and 6 making 18 ?
Poonam said:
1 decade ago
Please give altarnate methad to solve this question, then we know wether the ans you got is right or wrong.
Sandya said:
1 decade ago
@ nikita prasad
Its really good explanation. I had lot more confusion at this step. Now I'm clear. ThanQ.
Its really good explanation. I had lot more confusion at this step. Now I'm clear. ThanQ.
Lallitha said:
1 decade ago
In given question, A is assisted on every 3rd days but you all doing for one 3rd day?
Can anyone explain?
Can anyone explain?
Jansi said:
1 decade ago
@Sami.
Dear friend A is assisted with B & C every 3rd day, Means first 2 days A is doing work lonely.
Dear friend A is assisted with B & C every 3rd day, Means first 2 days A is doing work lonely.
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