if takes 18 hours for 15 machines to complete a jjob.how many hours will 9 machines take to complete the same job?
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answer =10.8 hrs
bcz 15machine takes 18 hrs
so 1 machine takes 18/15 hrs
and 9 machines will take= 18/15*9=10.6 hours
bcz 15machine takes 18 hrs
so 1 machine takes 18/15 hrs
and 9 machines will take= 18/15*9=10.6 hours
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