题库搜索>问题求解PS-12787
Of the mutual funds on a “select list,”1/3 have 5-star ratings, and 2/5 of the remaining funds have 4-star ratings. If the remaining 300 funds on the list have 3-star ratings, how many funds are on the list?
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1/3 = 5/15 :5STAR
2/5 of the remaining funds =(2/3 )* (2/5)=4/15 :4 STAR
剩下 6/15 : 3STAR : 300
50*15=750
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