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 :
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 19 of 35.
Jeevanantham M said:
2 years ago
@Ayansh.
For this;
(A+B) 's work rate = 1/15 + 1/20 = (4/60 + 3/60) = 7/60.
For this;
(A+B) 's work rate = 1/15 + 1/20 = (4/60 + 3/60) = 7/60.
(21)
Mani said:
9 years ago
How to find the solution of this question? Please solve this by easy method.
Vikas said:
1 decade ago
Thanks for your explanation. But it take much time. Can you tell me tricks.
Rajendra said:
1 decade ago
Good explanation but I can't understand how the 1- (7/15) is became 8/15.
Nagasuriya said:
1 decade ago
Dear friends how to solve this calculate 7/60 x4 =7/15 please explain me?
Sammed said:
9 years ago
Thank you, everyone those have written explanation here. It really helps.
Amrinder said:
1 decade ago
4/60 is ok 4 is no of working and 60 is hours in day
cant undestand 3/60
cant undestand 3/60
Neha garg said:
1 decade ago
Let total work is 1
1/15+1/20=x/4
7/60*4=x
that means x=7/15
1-7/15=8/15
1/15+1/20=x/4
7/60*4=x
that means x=7/15
1-7/15=8/15
Rashmi said:
1 decade ago
How did you get 7/60 please answer in simple method and tell how got 7.
Fazeena said:
7 years ago
I can't understand 1-7/15.
So, please explain me again or another way.
So, please explain me again or another way.
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