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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 100a+150（10-a） ≤1200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        100 * a + 150 * ( 10 - a ) ≤1200         (1)

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    From inequality(1)：
         a ≥ 6

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    The final solution set is :
         a ≥ 6
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 60a+100（10-a） ≥680 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        60 * a + 100 * ( 10 - a ) ≥680         (1)

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    From inequality(1)：
         a ≤ 8

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    The final solution set is :
         a ≤ 8

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