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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 400a×45+(6－a)×280×30 ≥240 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        400 * a × 45 + ( 6 - a ) × 280 × 30 ≥240         (1)

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    From inequality(1)：
         a ≥ -209/40

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    The final solution set is :
         a ≥ -209/40

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