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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 85%z+90%（800-z） ≥800×88% .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        85 % * z + 90 % * ( 800 - z ) ≥800 × 88 %         (1)

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    From inequality(1)：
         z ≤ 320

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    The final solution set is :
         z ≤ 320

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