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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 5x＋15（1200－x） ≤[25x+45×（1200-x)]×0.3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        5 * x + 15 * ( 1200 - x ) ≤ ( 25 * x + 45 × ( 1200 - x ) ) × 0.3         (1)

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    From inequality(1)：
         x ≥ 450

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    The final solution set is :
         x ≥ 450

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