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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 10y+3（21-y） ≥39 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        10 * y + 3 * ( 21 - y ) ≥39         (1)

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    From inequality(1)：
         y ≥ -24/7

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    The final solution set is :
         y ≥ -24/7

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