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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 50b加40乘以（30减b）大于或等于1240 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        50 * b + 40 * ( 30 - b ) ≥1240         (1)

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    From inequality(1)：
         b ≥ 4

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    The final solution set is :
         b ≥ 4

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