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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 100a+30(10-a) >= 485 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        100 * a + 30 * ( 10 - a ) >= 485         (1)

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    From inequality(1)：
         a ≥ 2.642857

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    The final solution set is :
         a ≥ 2.642857
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 20a+50(10-a) >= 335 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * a + 50 * ( 10 - a ) >= 335         (1)

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    From inequality(1)：
         a ≤ 11/2

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    The final solution set is :
         a ≤ 11/2

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