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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality n*30+(n-1)*12 <= 3000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         n * 30 + ( n - 1 ) * 12 <= 3000         (1)

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    From inequality(1)：
         n ≤ 502/7

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    The final solution set is :
         n ≤ 502/7

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