五、六年级学生参加植树活动．已知五、六年级共有学生100人，六年级每个学生分5棵树苗，五年级每个学生分3棵树苗，正好分完了388棵苗．问五、六年级各有多少学生？
设六年级有x人，那么五年级就有（100-x）人，由题意得：
5x+（100-x）×3=388
5x+300-3x=388
2x=88
x=44
五年级：100-44=56（人）
答：五年级有56人，六年级有44人．
Do you think of your parents? "Yes, of course." You may answer, ¨I buy a present for my mother on .And I give my father a present on Father's Day, .” Then what about the other days of a year? Always to think of your parents, not just on some important days. I have a friend who alone, because her parents live in another city. One day l went to see her. We had a nice chat. Then she wanted to make a .She dialed the number, but then she put the phone . After about ten seconds, she dialed the number again. "Hi, Mum…” Later I asked, "Why did you dial the number ?”she smiled, "My parents are old. They can not get close to the telephone .I always do so when I call them. I just want to give them time to answer the call." My friend is a good girl. She is always her parents. You also want to be a good child, right? So why not learn from her?
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