If 9 examiners can examine a certain number of answer books in 12 days, working 5 hours a day; for how many hours a day would 4 examiners have to work in order to examine twice the number of answer books in 30 days?
Solution
Correct Answer: Option C
9 examiners 12 days by working = 5 hours
1 " 1 " " " = 5 \( \times \) 9 \( \times \) 12 hours
4 " 30 " " " = (5 \( \times \) 9 \( \times \) 12) / (4 \( \times \) 30 ) hours
So, twice the work need twice time So answer is 4.5 \( \times \) 2 = 9 hours
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