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Who knows all the answers to the top class exercise 106~ 107 in the seventh grade mathematics (People's Education Edition)?
Hello (1,) Solution: Buying together can save money:

1240- 104x9=304 (yuan)

(2) If there are x people in 1 class and (104-x) people in class 2, we can get:

13x+ 1 1( 104-x)= 1240

13x+ 1 144- 1 1x = 1240

2x= 1240- 1 144

2x=96

x=48

Then class 2 has: 104-48=56.