Mathematics is in Class One for six years. - Training Enrollment Network

Mathematics is in Class One for six years.

Solution: Suppose there are X students in Class Two, Grade Six.

Total score of class one: 80x35=2800,

Total score of Class Two: 87.5.

The average score is (2800+87.5x)/(35+x)=84, so x=40, which means there are 40 students in Class Two, Grade Six.

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