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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality x［30-2（x-15）］ ≥400 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x * ( 30 - 2 * ( x - 15 ) ) ≥400         (1)

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    From inequality(1)：
         10 ≤ x ≤ 20

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    The final solution set is :
         10 ≤ x ≤ 20

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