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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 10y <(500-15y)/10 <20y .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        10 * y < ( 500 - 15 * y ) / 10         (1)
         ( 500 - 15 * y ) / 10 <20 * y         (2)

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    From inequality(1)：
         y < 4.347826
    From inequality(2)：
         y ＞ 2.325581

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    From inequalities (1) and (2)
         2.325581 < y < 4.347826     (3)

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    The final solution set is :
         2.325581 < y < 4.347826

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