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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality a(15*30+25*10)+(50-a)(20*15+20*25) ≤38000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a * ( 15 * 30 + 25 * 10 ) + ( 50 - a ) * ( 20 * 15 + 20 * 25 ) ≤38000         (1)

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    From inequality(1)：
         a ≥ 20

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    The final solution set is :
         a ≥ 20

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