136. A can finish a work in 24 days, B in 9 days and C in 12 days. B and C start the work but are forced to leave after 3 days. The remaining work was done by A in:

✅ The correct answer is option C.
(B + C)’s 1 day’s work =

1
+
1

=
7
.

9
12
36

Work done by B and C in 3 days =

7
x 3

=
7
.

36
12

Remaining work =

1 –
7

=
5
.

12
12

Now,
1
work is done by A in 1 day.

24

So,
5
work is done by A in

24 x
5

= 10 days.

12
12