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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (135)a+180*(60-a) ≤9900 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 135 ) * a + 180 * ( 60 - a ) ≤9900         (1)

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    From inequality(1)：
         a ≥ 20

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    The final solution set is :
         a ≥ 20

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