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:
347 comments Page 3 of 35.
Rakesh said:
1 year ago
1/15+1/20 LCM of this is 60.
So,
(1/15 * 60 + 1/20 * 60)/60we can simplify this you can get (4+3)/60 = 7/60.
So,
(1/15 * 60 + 1/20 * 60)/60we can simplify this you can get (4+3)/60 = 7/60.
(4)
Ashim said:
1 year ago
How 7/60 came? Anyone, please explain to me.
(14)
Sivagami said:
1 year ago
How 7/60 came? Please explain.
(6)
Kalai said:
1 year ago
How remaining work =1? Please explain to me.
(7)
Hemamalini said:
2 years ago
How remaining work =1 ? Please explain me.
(35)
Raghu said:
2 years ago
How 7 comes? Please explain.
(22)
Sowmiya said:
2 years ago
How remaing work =1? Please explain to me.
(20)
Lakshmanan S said:
2 years ago
How come remaining work 1- 7/15? Please explain me.
(71)
Sahil said:
2 years ago
4( 1/15 + 1/20 ) = work done by both of them together
Work Done + Work left =1 =>because the work is 100% completed
4( 1/15 + 1/20 ) + work left = 1;
work left = 1 - (28/ 60);
Then, work left = 8/15;
Work Done + Work left =1 =>because the work is 100% completed
4( 1/15 + 1/20 ) + work left = 1;
work left = 1 - (28/ 60);
Then, work left = 8/15;
(66)
Portia said:
2 years ago
How did 1/15 +1/20 turn into 7/60? Someone, please explain.
(43)
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