Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 4     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 < x         (1)
         x <21         (2)

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    From inequality(1)：
         x ＞ 4
    From inequality(2)：
         x < 21

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    From inequalities (1) and (2)
         4 < x < 21     (3)

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    The final solution set is :
         4 < x < 21
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 40(20-x)+70x <1000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 * ( 20 - x ) + 70 * x <1000         (1)

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    From inequality(1)：
         x < 20/3

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    The final solution set is :
         x < 20/3

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