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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 70-a ≤3a, .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        70 - a ≤3 * a ,         (1)

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    From inequality(1)：
         a ≥ 35/2

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    The final solution set is :
         a ≥ 35/2
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 25a+15*(70-a) ≤1245 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        25 * a + 15 * ( 70 - a ) ≤1245         (1)

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    From inequality(1)：
         a ≤ 39/2

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    The final solution set is :
         a ≤ 39/2

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