Aptitude - Time and Work - Discussion

Discussion Forum : Time and Work - General Questions (Q.No. 1)
1.
A can do a work in 15 days and B in 20 days. If they work on it together for 4 days, then the fraction of the work that is left is :

1
4

1
10

7
15

8
15

Answer: Option
Explanation:

A's 1 day's work = 1 ;
15

B's 1 day's work = 1 ;
20

(A + B)'s 1 day's work = ( 1 + 1 ) = 7 .
15 20 60

(A + B)'s 4 day's work = ( 7 x 4 ) = 7 .
60 15

Therefore, Remaining work = ( 1 - 7 ) = 8 .
15 15

Discussion:
344 comments Page 29 of 35.

Sunita said:   1 decade ago
Why they take like this 1-(7/15)?

Devi sri prasad said:   1 decade ago
I think LCM is the best solution.

Vikas said:   9 years ago
Can you explain how is 7/60 came?

Shiva said:   8 years ago
Why sub (1-7/15)? please explain.

Sunil said:   1 decade ago
How that 60 came I can't got it?

Priya said:   10 years ago
How 7 came please tell me again?

Harkanwal said:   9 years ago
Why 32 by 60? Explain in detail.

Tabbu said:   7 years ago
Please explain this step 1-7/15.

Subho said:   7 years ago
Kindly solve it in ratio method.

Vishwanath said:   1 decade ago
7/60 x4 =7/15 please explain me


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