Question

11) X and Y can do a job in 12 days. After working
for two days, they are assisted by Z, who works
at the same rate as X. The remaining work gets
completed in 25/4days. In how many days will Y
alone do the work?​

Answer 1

Explanation:

Work done by A in 1 day =

9

1

Work done by B in 1 day =

18

1

Work done by B in last 3 days =

18

1

×3=

6

1

Remaining work=1−

6

1

=

6

5

Work done by A and B in 1 day =

9

1

+

18

1

=

18

3

=

6

1

Hence no. of days in which A and B worked together is =

6

1

6

5

=5 days

Then total time to complete the work =3+5=8 days.