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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 70x+35(80-x) <= 4200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        70 * x + 35 * ( 80 - x ) <= 4200         (1)

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    From inequality(1)：
         x ≤ 40

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    The final solution set is :
         x ≤ 40

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