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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 84.2a+46.6(20-a) ≥1400 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        84.2 * a + 46.6 * ( 20 - a ) ≥1400         (1)

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    From inequality(1)：
         a ≥ 12.446809

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    The final solution set is :
         a ≥ 12.446809

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