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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （X-30）【600-（x-50)20】 ≥8000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( X - 30 ) * ( 600 - ( X - 50 ) * 20 ) ≥8000         (1)

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    From inequality(1)：
         40 ≤ X ≤ 70

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    The final solution set is :
         40 ≤ X ≤ 70

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