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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 20x+30(100-x) <= 2800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x + 30 * ( 100 - x ) <= 2800         (1)

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    From inequality(1)：
         x ≥ 20

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    The final solution set is :
         x ≥ 20
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 40x+20(100-x) <= 2800 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 * x + 20 * ( 100 - x ) <= 2800         (1)

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    From inequality(1)：
         x ≤ 40

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    The final solution set is :
         x ≤ 40

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