Worker's performance

Fifteen workers paint 180 m fence in 3 days. In how many days will nine workers paint a 360 m fence? We assume that each worker has the same, constant and unchangeable performance.

Correct answer:

x =  10 d

Step-by-step explanation:

r=180/(3 15)=4 m/d/r l=360 m  x=l/(9 r)=360/(9 4)=10 d

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