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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3x+13*(4000-x) <28000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3 * x + 13 * ( 4000 - x ) <28000         (1)

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    From inequality(1)：
         x ＞ 2400

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    The final solution set is :
         x ＞ 2400

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