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 6 of 36.
Vishnu said:
1 decade ago
Why you have taken the a+b+c? A is assisted by only B, C know.
Anbu said:
1 decade ago
How you got 6/60?
I think the answer is 12.
I think the answer is 12.
Beeribrahim said:
1 decade ago
How it is user
Now, 1 work is done in 3 days.
5
Whole work will be done in (3 x 5) = 15 days.
Now, 1 work is done in 3 days.
5
Whole work will be done in (3 x 5) = 15 days.
Shreekanth said:
1 decade ago
@Vishnu...
As per the statement A will do the work three days continuosly but only on third day B & C will assist, so
A's thrid day work must also include with both B & C
that's why...
(A + B + C)'s 1 day's work is taken
As per the statement A will do the work three days continuosly but only on third day B & C will assist, so
A's thrid day work must also include with both B & C
that's why...
(A + B + C)'s 1 day's work is taken
Vijay said:
1 decade ago
1/20+1/(30X3)+1/(60X3) = 1/15
Is my way of solving correct?
Is my way of solving correct?
Chitra.G said:
1 decade ago
Why we take 2 days? Please help.
Roten said:
1 decade ago
@vikas.
Superb explanation. :-).
Superb explanation. :-).
Baskar said:
1 decade ago
@chitra
assisted by B and C on every third day
it means A's 2 days + (B&C)'s 1 day
from d 1st explanation u got
Work done in 3 days=(1/10 + 1/10)=1/5
dat is in 3 days=1/5 works
in ques dey ask "In how many days can A do the work"
now cross multiply..
(5*3) days=1 work..
1 work = 15 days...
now u got it ah?
assisted by B and C on every third day
it means A's 2 days + (B&C)'s 1 day
from d 1st explanation u got
Work done in 3 days=(1/10 + 1/10)=1/5
dat is in 3 days=1/5 works
in ques dey ask "In how many days can A do the work"
now cross multiply..
(5*3) days=1 work..
1 work = 15 days...
now u got it ah?
Samathu said:
1 decade ago
Nice explanation baskar.
Munish said:
1 decade ago
Thank you Vikas for your information, I have understood.
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