Math

A factory produces 12000 plastic bottles by using 3 machines 8 hours a day. One machine is out of order now. The owner wants to produce 15000 plastic bottles, How many hours the remaining machines have to work to produce the required bottles?

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  1. 3 machines take 8 hours to do 12000 bottles
    1 machine takes 24 hours to do 12000 bottle
    2 machines take 12 hrs to do 12000 bottles
    15000/12000 = 5/4 <--- should take 5/4 times as long
    so 2 machines take (12)(5/4) hrs to do 15000 bottles
    time taken = 15 hrs

    check my arithmetic

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