A contractor has two teams of workers : team A and team B. Team A can complete a job in 8 days and team B can do the same job in 16 days. Team A starts working on the job and team B joins A after 2 days. Team A withdraws after 3 more days. Number of days for which team B should further work to complete the job is
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[16+2]-[8+3]
18-11
=7