Diggers

Eight diggers will do the job in 85 hours. After 21 hours, 3 diggers had to leave. How many hours will the work be done?

Correct answer:

t =  123.4 h

Step-by-step explanation:


8•85 = 21•8 + (t-21)•(8-3)

5t = 617

t = 617/5 = 123.4

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