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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1000x+800(15-x)+500(15-x) <= 12000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1000 * x + 800 * ( 15 - x ) + 500 * ( 15 - x ) <= 12000         (1)

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    From inequality(1)：
         x ≥ 25

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    The final solution set is :
         x ≥ 25

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