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 book in 30 days?
Solution
Correct Answer: Option C
let, required time x hour day 30 days= 30x hour at first stage, 12 days=60 hour 4 examiners examines in=60x9/4=135 hours so,time needed to exmine the double answer books is=135x2=270 hour here, 30x=270 so.x=90
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