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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20% <30*15%+50x/80 <35% .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        20 % <30 * 15 % + 50 * x / 80         (1)
        30 * 15 % + 50 * x / 80 <35 %         (2)

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    From inequality(1)：
         x ＞ -172/25
    From inequality(2)：
         x < -166/25

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    From inequalities (1) and (2)
         -172/25 < x < -166/25     (3)

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    The final solution set is :
         -172/25 < x < -166/25

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