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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 150b+90(200-b) >21000 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        150 * b + 90 * ( 200 - b ) >21000         (1)

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    From inequality(1)：
         b ＞ 50

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    The final solution set is :
         b ＞ 50

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