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Mathematics
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_________?
A
15 days
Option A
B
20 days
Option B
25 days
Correct answer
D
30 days
Option D
Correct answer: C
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