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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 360 <= 5.4x+3.6(90-x) <= 365 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        360 <= 5.4 * x + 3.6 * ( 90 - x )         (1)
         5.4 * x + 3.6 * ( 90 - x ) <= 365         (2)

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    From inequality(1)：
         x ≥ 20
    From inequality(2)：
         x ≤ 205/9

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    From inequalities (1) and (2)
         20 ≤ x ≤ 205/9    (3)

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    The final solution set is :
         20 ≤ x ≤ 205/9

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