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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 150（0.9x-4）+120（x-5） ≥420 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        150 * ( 0.9 * x - 4 ) + 120 * ( x - 5 ) ≥420         (1)

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    From inequality(1)：
         x ≥ 6.352941

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    The final solution set is :
         x ≥ 6.352941

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