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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality x+x+20 ≥72 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x + x + 20 ≥72         (1)

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    From inequality(1)：
         x ≥ 26

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    The final solution set is :
         x ≥ 26
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 40x+18(x+20) ≤2000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 * x + 18 * ( x + 20 ) ≤2000         (1)

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    From inequality(1)：
         x ≤ 28.275862

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    The final solution set is :
         x ≤ 28.275862

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