How to solve this problem (the second grade math problem in primary school)

Profit and loss problem, formula-(profit+loss) ÷ the difference between the two shares = the number of people (this question is equal to the number of classes, and the smaller number is obtained according to the formula first). So the class size is: (4+4)÷(8-7)=8 (table tennis) The number is: 7×8+4=60.

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[High School Mathematics Inquiry Teaching Mode and Teaching Design Case] High School Mathematics Teaching Mode