An electrical appliance factory originally planned to produce 4,200 washing machines in 15 days. The task is actually completed 3 days ahead of schedule, and how many washing machines are actually produced every day?
一个电器厂原计划15天生产洗衣机4200台．实际提前3天完成任务，实际每天生产洗衣机多少台？
<result>300</result>