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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 22400 ≤200x+240(100-x) ≤22500 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        22400 ≤200 * x + 240 * ( 100 - x )         (1)
        200 * x + 240 * ( 100 - x ) ≤22500         (2)

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    From inequality(1)：
         x ≤ 40
    From inequality(2)：
         x ≥ 75/2

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    From inequalities (1) and (2)
         75/2 ≤ x ≤ 40    (3)

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    The final solution set is :
         75/2 ≤ x ≤ 40

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