| Work done by X in 4 days = |
❨ |
1 |
x 4 |
❩ |
= |
1 |
. |
| 20 |
5 |
| Remaining work = |
❨ |
1 - |
1 |
❩ |
= |
4 |
. |
| 5 |
5 |
| (X + Y)'s 1 day's work = |
❨ |
1 |
+ |
1 |
❩ |
= |
8 |
= |
2 |
. |
| 20 |
12 |
60 |
15 |
| Now, |
2 |
work is done by X and Y in 1 day. |
| 15 |
| So, |
4 |
work will be done by X and Y in |
❨ |
15 |
x |
4 |
❩ |
= 6 days. |
| 5 |
2 |
5 |
Hence, total time taken = (6 + 4) days = 10 days.
