In Dewey Elementary School, there are two second-grade classes: class A has 35 students and class B has 45 students. If 40% of the students in class A walk to school, and 80% of the students in class B walk to school, what percent of all the students in the second-grade at Dewey Elementary walk to school?
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A40%
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B42.5%
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C60%
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D62.5%
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E75%
显示答案
正确答案: D