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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality [30z+50(30-z)]*80% <1000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 30 * z + 50 * ( 30 - z ) ) * 80 % <1000         (1)

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    From inequality(1)：
         z ＞ 25/2

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    The final solution set is :
         z ＞ 25/2

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