9 people can complete the electric fitting in a building in 5 days. How many people are required to complete the electric fitting in 3 days? (Assume that each person works at the same rate.)
a) 7
b) 11
c) 15
d) 18
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Answer:
It takes 5 days for 9 people
it will take 1 day for 45 people
it will be completed in 3 days by 15 people
So answer is 15(c)
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