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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (1-0.4)*18 <= (4+0.15)*(k-18) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 1 - 0.4 ) * 18 <= ( 4 + 0.15 ) * ( k - 18 )         (1)

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    From inequality(1)：
         k ≥ 20.60241

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    The final solution set is :
         k ≥ 20.60241

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