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On average, 15 science and technology books and 4 story books were distributed to each person.
(1) There are x people in the reading group.

6x+ 12=8x-6

x=9

(2) Assumption: There are X children in kindergarten.

2(5x+ 15)= 14x-30

x= 15

Apple:14x15-30 =180

(3) There are X classes in the school.

2(2x+4)=5x-2

x= 10

Volleyball: 5x-2=48

Football: 2x+4=24

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