Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 7y <4y+20 <8y .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        7 * y <4 * y + 20         (1)
        4 * y + 20 <8 * y         (2)

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    From inequality(1)：
         y < 20/3
    From inequality(2)：
         y ＞ 5

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    From inequalities (1) and (2)
         5 < y < 20/3     (3)

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    The final solution set is :
         5 < y < 20/3

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