| (1) | 18 days | (2) | 27 days | |
| (3) | 26.67 days | (4) | 16 days |
Explanatory Answer
If A can do complete a project in 20 days, then A will
complete
1/20 th
of the project in a day.
Similarly, B will complete
1/30th
of the project in a day.
Let the total number of days taken to complete the project be x days.
Then, B would have worked for all x days, while A would have worked for (x � 10)
days.
Therefore, A would have completed
x-10 / 20th
of the project and B would have complete x/30
th of the project.
i.e.,
x-10 / 20 + x/30 =1
Solving for x, we get x = 18.
