Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 40a+20(10-a) ≥260 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        40 * a + 20 * ( 10 - a ) ≥260         (1)

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    From inequality(1)：
         a ≥ 3

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    The final solution set is :
         a ≥ 3
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 10a+20(10-a) ≥150 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        10 * a + 20 * ( 10 - a ) ≥150         (1)

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    From inequality(1)：
         a ≤ 5

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    The final solution set is :
         a ≤ 5

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