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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 120-x ≤2x .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        120 - x ≤2 * x         (1)

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    From inequality(1)：
         x ≥ 40

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    The final solution set is :
         x ≥ 40
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 15x+12（120-x） ≤1600 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        15 * x + 12 * ( 120 - x ) ≤1600         (1)

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    From inequality(1)：
         x ≤ 160/3

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    The final solution set is :
         x ≤ 160/3

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