Maths If 9 examiners working 5 hours a day can check some notebooks in 12 days, then how many hours a day will 4 examiners have to work to check twice that notebooks in 30 days?
| Q.201339: If 9 examiners working 5 hours a day can check some notebooks in 12 days, then how many hours a day will 4 examiners have to work to check twice that notebooks in 30 days? |
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