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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 30*(30*4+20)+(50-x)*(3*30+4*20) <= 8000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 * ( 30 * 4 + 20 ) + ( 50 - x ) * ( 3 * 30 + 4 * 20 ) <= 8000         (1)

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    From inequality(1)：
         x ≥ 27.647059

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    The final solution set is :
         x ≥ 27.647059

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