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

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

---

    From inequality(1)：
         a ≥ 15

---

    The final solution set is :
         a ≥ 15
[ 2/2Inequality]
    Assignment:Find the solution set of inequality 0.5a+1.5（30-a） ≥28 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.5 * a + 1.5 * ( 30 - a ) ≥28         (1)

---

    From inequality(1)：
         a ≤ 17

---

    The final solution set is :
         a ≤ 17

Your problem has not been solved here? Please take a look at the  hot problems ！