Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 20x+30（8-x） ≥210 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x + 30 * ( 8 - x ) ≥210         (1)

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    From inequality(1)：
         x ≤ 3

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    The final solution set is :
         x ≤ 3
[ 2/2Inequality]
    Assignment:Find the solution set of inequality （90-20）x+(130-30)(8-x) ≤770 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 90 - 20 ) * x + ( 130 - 30 ) * ( 8 - x ) ≤770         (1)

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    From inequality(1)：
         x ≥ 1

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    The final solution set is :
         x ≥ 1

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