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P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?

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P and Q can complete a task in 50 and 20 days respectively. In how many days can they complete 70% of the task if they work together?
1). 20 days
2). 30 days
3). 40 days
4). 10 days


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4 vote
Answered by on | Votes 4 |

P’s one - day work = 1/50

Q’s one - day work = 1/20

One - day work of both P and Q = 1/50 + 1/20 = 7/100

Total time taken to complete the work = 100/7 days

Time taken to complete 70% of work = (70/100) × (100/7) = 10 days

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