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 ＞ 23/100
    From inequality(2)：
         x < 47/100

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    From inequalities (1) and (2)
         23/100 < x < 47/100     (3)

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    The final solution set is :
         23/100 < x < 47/100

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