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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1560 ≥30y+2000-50y .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1560 ≥30 * y + 2000 - 50 * y         (1)

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    From inequality(1)：
         y ≥ 22

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    The final solution set is :
         y ≥ 22

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