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Six 1 Mathematics
Boys in Class One: 30×( 1-20%)=24 (people)

Double group: 30-24=6 people

Each serving: 6(7-5)= 3 (person)

Boys in Class Two: 3×5= 15 (person)

1 class girl: 3×7=2 1 (person)

* * *: (24+2 1) × 2 = 90 (person)

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