Four workers

Four workers will lay the floor of the gym in six hours. After an hour of working together, one of the workers left to the doctor. How long before the remaining three workers finish their work?


t = 6:40 h Wrong answer


4*6 = 4*1 + 3*t

3t = 20

t = 203 ≈ 6.666667

Calculated by our simple equation calculator.

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