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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 80n+120（20-n） ≤2200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        80 * n + 120 * ( 20 - n ) ≤2200         (1)

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    From inequality(1)：
         n ≥ 5

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    The final solution set is :
         n ≥ 5

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