Aptitude - Time and Work - Discussion
Discussion Forum : Time and Work - General Questions (Q.No. 21)
21.
A takes twice as much time as B or thrice as much time as C to finish a piece of work. Working together, they can finish the work in 2 days. B can do the work alone in:
Answer: Option
Explanation:
| Suppose A, B and C take x, | x | and | x | days respectively to finish the work. |
| 2 | 3 |
| Then, |  |
1 | + | 2 | + | 3 |  |
= | 1 |
| x | x | x | 2 |
 |
6 | = | 1 |
| x | 2 |
x = 12.
So, B takes (12/2) = 6 days to finish the work.
Discussion:
68 comments Page 6 of 7.
Rajshekar said:
6 years ago
A x.
B 2x.
C 3x.
A+B+B = 1/2,
X+2x+3x = 1/2.
6x=1/2.
X=1/12.
So, be alone =2x = 2 * 1/12 = 1/6 = 6days.
B 2x.
C 3x.
A+B+B = 1/2,
X+2x+3x = 1/2.
6x=1/2.
X=1/12.
So, be alone =2x = 2 * 1/12 = 1/6 = 6days.
(9)
G JOGI RAO said:
10 years ago
Hi @Kiran.
If 6A = 2 then A = 3.
But you said it A = 12 give proper explanation?
If 6A = 2 then A = 3.
But you said it A = 12 give proper explanation?
Srihari said:
1 decade ago
Hi Meera,
It is not right method because A+B+C's 1 day work is only 1/2 not 1/6.
It is not right method because A+B+C's 1 day work is only 1/2 not 1/6.
Ananth said:
1 decade ago
How the total work equation became as (1/x)+(2/x)+(3/x)=1/2
Please explain.
Please explain.
Banjeet said:
4 years ago
A : B : C = 6 : 3 : 2,
11*2= 22 work,
So, B doing = (3/11) * 22 = 6 days.
11*2= 22 work,
So, B doing = (3/11) * 22 = 6 days.
(22)
Raj said:
8 years ago
@Ravi.
Where you get 12 unit work in 1 days and how please explain it?
Where you get 12 unit work in 1 days and how please explain it?
Pushpendra said:
8 years ago
Yes, right @Ravi.
Your method of explanation is clear, Thanks @Subhas.
Your method of explanation is clear, Thanks @Subhas.
Loki said:
8 years ago
a+2a+3a = 2days.
6a = 2days,
a = 1/3(this is total),
3*2 = 6.
6a = 2days,
a = 1/3(this is total),
3*2 = 6.
Kumar said:
1 decade ago
How the work equation became as (1/x)+(2/x)+(3/x)=1/2
Bulu said:
7 years ago
@Manish, @Kiran.
Thanks for explaining the solution.
Thanks for explaining the solution.
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