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108÷(5+4)
=108÷9
=12
12×5=60
12×4=48

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36除以3等于12     15-12=3 kg

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作文
My friend li hua came  to  visit  me  on  may day. during the follow days i showed him around the city .we went to the guangzhou museum on the morning of may2 .we learned much about the history of guangzhou. in the afternoon,we climbed the baiyun hills .it was really great fun! in the evening ,i took li hua to the night zoo. it was interesting to see animals at night. the next day ,we went to the bookshops to buy books.though we were very tired ,we enjoy ourselves very much.

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假定     85分以上为优          75-85之间为良      60分以上为及格
则       85分以上有七分之一    75-85有三分之一    60分以上有二分之一
         60分以下有二分之一   
设总人数为n 则由于n<=50
且n是2，3，7的倍数
故n只可能是2*3*7=42
又 60分以上有二分之一故60分以下有二分之一
故  不及格人数为21
    班级总人数为42

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