The excavation was carried out in 4 days and 5 workers worked on it for 7 hours a day. Determine how long it would take to excavate if 7 workers worked on it 8 hours a day.

Correct answer:

x =  2.5

Step-by-step explanation:

4•5•7 = 7•8•x

56x = 140

x = 5/2 = 2.5

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