AMC8 2009
AMC8 2009 · Q2
AMC8 2009 · Q2. It mainly tests Ratios & proportions.
On average, for every 4 sports cars sold at the local car dealership, 7 sedans are sold. The dealership predicts that it will sell 28 sports cars next month. How many sedans does it expect to sell?
当地汽车经销商平均每卖出4辆跑车，就卖出7辆轿车。经销商预测下个月将卖出28辆跑车。它预计卖出多少辆轿车？
(A)
7
7
(B)
32
32
(C)
35
35
(D)
49
49
(E)
112
112
Answer
Correct choice: (D)
正确答案：（D）
Solution
Answer (D): Let $s=$ number of sedans. Set up a proportion: $\frac{4}{7}=\frac{28}{s}=\frac{4(7)}{7(7)}=\frac{28}{49}$. So the dealership expects to sell 49 sedans.
答案（D）：设 $s=$ 轿车的数量。列比例：$\frac{4}{7}=\frac{28}{s}=\frac{4(7)}{7(7)}=\frac{28}{49}$。因此，该经销商预计会卖出 49 辆轿车。
Topics
Related Questions
Practice full AMC exams on amcdrill.
Try full-length practice and diagnostics at www.amcdrill.com.