Repair pipe

Twenty workers had to repair broken pipes in 30 days. After fourteen days, four laborers joined them. How long did the pipe repair work last?

Correct answer:

x =  27.3333 d

Step-by-step explanation:


20·30 = 20·14 + (20+4)·(x-14)

24x = 656


x = 656/24 = 27.33333333

x = 82/3 ≈ 27.333333

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