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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 10*x+15*(45-x) <= 560 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        10 * x + 15 * ( 45 - x ) <= 560         (1)

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    From inequality(1)：
         x ≥ 23

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    The final solution set is :
         x ≥ 23
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 20*x+15*(45-x) >= 548 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * x + 15 * ( 45 - x ) >= 548         (1)

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    From inequality(1)：
         x ≥ -127/5

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    The final solution set is :
         x ≥ -127/5

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