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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 90a+60(60-a) ≤43200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        90 * a + 60 * ( 60 - a ) ≤43200         (1)

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    From inequality(1)：
         a ≤ 1320

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    The final solution set is :
         a ≤ 1320
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 2a ≥600-a .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2 * a ≥600 - a         (1)

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    From inequality(1)：
         a ≥ 200

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    The final solution set is :
         a ≥ 200

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