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

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

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    From inequality(1)：
         a ≤ 40

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    The final solution set is :
         a ≤ 40
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 2400*a+3000(120-a) <= 337200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2400 * a + 3000 * ( 120 - a ) <= 337200         (1)

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    From inequality(1)：
         a ≥ 38

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    The final solution set is :
         a ≥ 38

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