Diggers

Eight diggers will do the job in 85 hours. After 21 hours, three 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

t = 617/5 = 123.4

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