题目信息
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?
A:40%
B:42.5%
C:60%
D:62.5%
E:75%
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正确答案：
D:62.5%
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