译：一项粉刷工程,如果被7个油漆工做,23天完工.如果在工程进行了8天后,再加入28名油漆工,问还需几天完工?
23-8=15
（7+28）/7=5
15/5=3 天
A painting job can be completed by 7 painters in 23 days.If
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