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let a and b have to complete a job which is LCM(10,15)=30 units
so A completes 2 units per day and B completes 3 units per day and togather they will complete 5 units in one day
so to complete 30 units working togather they will take 30units/5units=6days
so A completes 2 units per day and B completes 3 units per day and togather they will complete 5 units in one day
so to complete 30 units working togather they will take 30units/5units=6days
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