25.
|
A can do a certain work in the same time in which B and C together can do it. If A and B together could do it in 10 days and C alone in 50 days, then B alone could do it in:
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|
|
15 days
|
|
20 days
|
|
|
25 days
|
|
30 days
|
|
Answer: Option C
Explanation:
(A + B)'s 1 day's work =
|
1
|
10
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(A + B + C)'s 1 day's work =
|
|
1
|
+
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1
|
|
=
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6
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=
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3
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. .... (i)
|
10
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50
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50
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25
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A's 1 day's work = (B + C)'s 1 day's work .... (ii)
From (i) and (ii), we get: 2 x (A's 1 day's work) =
|
3
|
25
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A's 1 day's work =
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3
|
.
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50
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B's 1 day's work
|
|
1
|
-
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3
|
|
=
|
2
|
=
|
1
|
.
|
10
|
50
|
50
|
25
|
So, B alone could do the work in 25 days.
