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Question

In an office, an employee plans to do a work in 15 days with 6 laptops. But after 8 days, he found that only 50% of the work is done with the laptops working for 7 hours a day. If he want to complete the work in the planned time with the laptops, how many hours per day the laptops have to work?

A 6 hours

B 12 hours

C 9 hours

D 10 hours

E None of these

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