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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 30x＋20（100-x） <1222 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 * x + 20 * ( 100 - x ) <1222         (1)

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    From inequality(1)：
         x < -389/5

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    The final solution set is :
         x < -389/5

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