A and B can do a job in 10days and 15 days respectively.they work on alternate days,A beginning the work.in how many days will the work be finished
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In 1 day A can finish 1/10 of work
In 1 day B can finish 1/15 of work
In 2 days if they work alternatively
Work finished=1/10+1/15=1/6
Days required to finish the whole work=2/(1/6)=12days
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