Independently 12921

Factory A can fulfill the order independently in 10 days. Factory B fulfills the same order in 16 days. How many days will the order be completed if only plant B works on it for 3 days and then both plants together?

Correct answer:

t =  8

Step-by-step explanation:

16t+10t3=1  t/16+(t3)/10=1  13t=104  t=13104=8  t=8

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