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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality 30小于等于47-b .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        30 ≤47 - b         (1)

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    From inequality(1)：
         b ≤ 17

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    The final solution set is :
         b ≤ 17
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 47-b小于等于40 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        47 - b ≤40         (1)

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    From inequality(1)：
         b ≥ 7

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    The final solution set is :
         b ≥ 7

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