# Repair pipe

20 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 result:

x =  27.3333 d

#### Solution:

20•30 = 20•14 + (20+4)•(x-14)

24x = 656

x = 82/3 ≈ 27.333333

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