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If 9 examiners can examine a certain num...

If 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day for hw may hours a day would 4 examiners a day for how many hours a day would 4 examines have to work in order to examine twice the number of answer books in 30 days? `6` b. `8` c. `9` d. 10

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Four examiners can examine a certain number of answer papers in 10 days by working for 5 hours a day. For how many hours in a day would 2 examiners have to work in order to examine twice the number of answer papers in 20 days?

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