Nine examiners can examine a certain number of answer books in 12 days – McqOptions

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1.	Nine examiners can examine a certain number of answer books in 12 days by working 5 hours a day. How many hours in a day should 4 examiners work to examine twice the number of answer books in 30 days?
A.	9
B.	11
C.	13
D.	17
Answer» B. 11

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