29.
|
A does 80% of a work in 20 days. He then calls in B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work?
|
|
|
23 days
|
|
37 days
|
|
|
37
|
|
40 days
|
|
Answer: Option C
Explanation:
Whole work is done by A in
|
|
20 x
|
5
|
|
= 25 days.
|
4
|
Now,
|
|
1 -
|
4
|
|
i.e.,
|
1
|
work is done by A and B in 3 days.
|
5
|
5
|
Whole work will be done by A and B in (3 x 5) = 15 days.
A's 1 day's work =
|
1
|
, (A + B)'s 1 day's work =
|
1
|
.
|
25
|
15
|
B's 1 day's work =
|
|
1
|
-
|
1
|
|
=
|
4
|
=
|
2
|
.
|
15
|
25
|
150
|
75
|
So, B alone would do the work in
|
75
|
= 37
|
1
|
days.
|
2
|
|
