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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 280-（x-40）/2*20 ≥130 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        280 - ( x - 40 ) / 2 * 20 ≥130         (1)

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    From inequality(1)：
         x ≤ 55

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    The final solution set is :
         x ≤ 55

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