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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 67.5（20-x）-500（2/3）x >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        67.5 * ( 20 - x ) - 500 * ( 2 / 3 ) * x >0         (1)

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    From inequality(1)：
         x < 3.367983

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    The final solution set is :
         x < 3.367983

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