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OpenStudy (anonymous):
Someone please help me with this ques. Middletown decided to sponsor a two day meeting for it's own middle-school students to study local environment problems. There are three middle schools in Middletown: Red Middle school with 618 students, White Middle School with 378 students, and Blue Middle School with 204 students. If 20 students delegates in all will attend the conference, how many should be selected from each school? (I need an answer with explanation, help me out!)
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