Calculate 38563

Six equally powerful machines produce 870 parts in 14 hours. Calculate in how many hours 870 parts will have four such machines.

Correct answer:

t2 =  21 h

Step-by-step explanation:

t1=14 h  6 t1=4 t2 6 14=4 t2  4t2=84  t2=484=21  t2=21=21 h

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