A A certain number of answer sheets can be checked in 12 days working 5 hours each day by 9 examiners. For how many hours a day should 4 examiners work to check twice the number of answer sheets in 30 days ? August 17, 2021 1 Min Read 0 31 August 17, 2021 1 Min Read 0 31 Answer : D. 9 hours Chain Rule Editor Continue Reading
