The machine

The machine was in operation for nine-tenths of an eight-hour working shift. How long was it running?

Result

t =  7.2 h
t2 = 7:12 h Wrong answer

Step-by-step explanation:

t=109 8=109 8=1072=536 h=7.2 h
t2=t=536=7.2=7:12 h



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arithmeticnumbersUnits of physical quantitiesGrade of the word problem

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