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    The balls, apples, oranges and tomatoes are linked in a certain order(按一定规律连在一起)．If there are 60 balls and fruit in all(总计)，how many balls are there altogether(共)?

    _____________________

    答案：12个
    解析：

    上面四个与下面四个一样。表明排列规律是15个一组。每组中有三个球。60个是四组，共12个球。


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