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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 55*（40-x)+70x <2400 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        55 * ( 40 - x ) + 70 * x <2400         (1)

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    From inequality(1)：
         x < 40/3

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    The final solution set is :
         x < 40/3

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