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 24 of 36.
Asanka said:
1 decade ago
If x = A worked day
{x*1/20 + x/3*(1/30+1/20)} = 1
x/20+x/60 = 1
x = 15.
{x*1/20 + x/3*(1/30+1/20)} = 1
x/20+x/60 = 1
x = 15.
Preethu said:
9 years ago
Why do we multiply it by 5?
How we get the answer as 15? Please help me.
How we get the answer as 15? Please help me.
Amit yadav said:
8 years ago
Explain the Step 1.
A's 2 day's work = 1/20*2= 1/10. Explain it clearly.
A's 2 day's work = 1/20*2= 1/10. Explain it clearly.
Randheer said:
1 decade ago
Please anyone can explain what formula we have to use for this problems?
Sandhu said:
1 decade ago
Sir I can't understand the calculation of 1\20+1\30+1\60 please tell me.
Deepa said:
8 years ago
Can you explain me how it is 1/5 and 3*15? I'm not getting this concept.
Vivek said:
6 years ago
I can't get 3rd step.
How do 1/10+1/10 came and how it is divided by 5?
How do 1/10+1/10 came and how it is divided by 5?
Keerthi said:
5 years ago
why are we multiplying 1/5 *3 in the last step? Please explain anyone.
Sundas said:
1 decade ago
I didn't get step 1 how a 2 days work? I mean why we multiply with 2?
Venkat said:
10 years ago
3 = 1/5.
So, our complete work done at 1.
So, 3*5 = 1/5*5.
15 = 1.
So, our complete work done at 1.
So, 3*5 = 1/5*5.
15 = 1.
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