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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 350a+220（30-a） ≤10000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        350 * a + 220 * ( 30 - a ) ≤10000         (1)

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    From inequality(1)：
         a ≤ 26.153846

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    The final solution set is :
         a ≤ 26.153846
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 100a+40（30-a） ≥2660 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        100 * a + 40 * ( 30 - a ) ≥2660         (1)

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    From inequality(1)：
         a ≥ 73/3

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    The final solution set is :
         a ≥ 73/3

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