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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 50c+40（50-c） ≤1820 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        50 * c + 40 * ( 50 - c ) ≤1820         (1)

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    From inequality(1)：
         c ≤ -18

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    The final solution set is :
         c ≤ -18

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