Lumberjacks

Fifteen lumberjacks would take 12 days to destroy the broken trees. How many days would this work require if the company added five workers to it after four days?

Correct answer:

t =  10

Step-by-step explanation:


15·12 = 15·4+(5+15)·(t-4)

20t = 200


t = 200/20 = 10

t = 10

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