Mathematics
Medium
Question
P, Q and R can do a work in 20, 30 and 60 days respectively. How many days does it need to complete the work if P does the work and he is assisted by Q and R on every third day?
A
10 days
B
14 days
C
15 days
✓ Official correct answer
D
9 days
Community credibility
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A
10 days
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B
14 days
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C
15 days
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D
9 days
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