Overview: 1 questions will be solved this time.Among them
           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 9a+13(800-a) <= 7700 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        9 * a + 13 * ( 800 - a ) <= 7700         (1)

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    From inequality(1)：
         a ≥ 675

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    The final solution set is :
         a ≥ 675

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