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In a math interest group in a school, there are 24 non-sixth grade students, 2 6 non-fifth grade students and 38 fifth and sixth grade students. How many are there in all?
(24+26+38)/2=44 (person)

Analysis:

24= total number-number of sixth-grade students

26= Total-Number of students in Grade 5

38= Number of students in Grade Five+Number of students in Grade Six.

Add up the above three formulas: (24+26+38)/2=44 (person)

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