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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 80(20-x)+70(30+0.5x) <= 4000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        80 * ( 20 - x ) + 70 * ( 30 + 0.5 * x ) <= 4000         (1)

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    From inequality(1)：
         x ≥ -20/3

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    The final solution set is :
         x ≥ -20/3

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