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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 28 ≤0.5x+1.5(30-x) ≤30 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        28 ≤0.5 * x + 1.5 * ( 30 - x )         (1)
        0.5 * x + 1.5 * ( 30 - x ) ≤30         (2)

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    From inequality(1)：
         x ≤ 17
    From inequality(2)：
         x ≥ 15

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    From inequalities (1) and (2)
         15 ≤ x ≤ 17    (3)

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    The final solution set is :
         15 ≤ x ≤ 17

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