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 33 of 35.
Sowmiya said:
1 year ago
How remaing work =1? Please explain to me.
(20)
Raghu said:
1 year ago
How 7 comes? Please explain.
(22)
Hemamalini said:
1 year ago
How remaining work =1 ? Please explain me.
(35)
Kalai said:
1 year ago
How remaining work =1? Please explain to me.
(7)
Sivagami said:
1 year ago
How 7/60 came? Please explain.
(6)
Ashim said:
1 year ago
How 7/60 came? Anyone, please explain to me.
(14)
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.
(3)
Sugan said:
1 year ago
1 (total work) - 7/15 (together completed work in 4 days).
Lcm = 15 then (15/15 -7/15) = 8/15.
Lcm = 15 then (15/15 -7/15) = 8/15.
(7)
Nitika said:
1 year ago
The reason why we've subtract from 1:
1 represents the whole work or complete work total work considered as 1(or 100%)
1 represents the whole work or complete work total work considered as 1(or 100%)
(23)
John michael said:
1 year ago
15 + 20 = 35,
15 * 20 = 300,
35/300 = 7/60.
15 * 20 = 300,
35/300 = 7/60.
(34)
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