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:
351 comments Page 19 of 36.
MEGA MATH said:
5 years ago
1/15 + 1/20 = 7/60,
7/60*4 = 28/60,
If we simplify 28/60 by 4, then it is 8/15.
7/60*4 = 28/60,
If we simplify 28/60 by 4, then it is 8/15.
Sowmi said:
1 decade ago
Why the value of b had multiplied but in final there is a subtraction is held?
Dinesh kumar said:
3 years ago
A = 1/15
B = 1/20
(A+B) = 1/15+1/20 = 7/15
The remaining work = 1-7/15 = 8/15.
B = 1/20
(A+B) = 1/15+1/20 = 7/15
The remaining work = 1-7/15 = 8/15.
(26)
Deepa said:
10 years ago
@Swetha.
Thanks! Your explanation is very good and it is easy to understand.
Thanks! Your explanation is very good and it is easy to understand.
Jeevanantham M said:
3 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:
10 years ago
Thank you, everyone those have written explanation here. It really helps.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers