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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 90z+100(20-z)小于等于1920 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        90 * z + 100 * ( 20 - z ) ≤1920         (1)

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    From inequality(1)：
         z ≥ 8

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    The final solution set is :
         z ≥ 8

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