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a) 30 days
b) 40 days
c) 50 days
d) 60 days
Correct Answer is:
b) 40 days
Here,
Person and Hours are inversely proportional to Days.
\therefore x=30\times\large\frac{20}{30}\normalsize\times\large\frac{18}{9}
\rightarrow x=40 days
Ans: It will take 30 persons a total of 40 days to finish the work if they each work for 9 hours per day.
