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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 3.6x+5.4(90-x) ≤369 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        3.6 * x + 5.4 * ( 90 - x ) ≤369         (1)

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    From inequality(1)：
         x ≥ 65

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    The final solution set is :
         x ≥ 65

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