Question

当地汽车经销店平均每卖出 $4$ 辆跑车，就会卖出 $7$ 辆轿车。经销店预测下个月会卖出 $28$ 辆跑车。那么预计会卖出多少辆轿车？

On average, for every $4$ sports cars sold at the local 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?

$7$

$32$

$35$

$49$

$112$

答案：D

知识点：比与比例

难度评级：450

解答：

可以列比例交叉相乘，得到所以 $\dfrac{4}{7} = \dfrac{28}{x}.$ $4x = 7 \cdot 28$ $x = 49$

所以正确答案是 D。

We can set up the following proportion: $\dfrac{4}{7} = \dfrac{28}{x}.$ Cross multiplying, we get $4x = 7 \cdot 28$ $x = 49$

Thus, D is the correct answer.

2009 AMC 8 第 2 题

答案：D

难度评级：450

解答：

其他年份的第 2 题