Question

六棵树沿着一条直路的一侧等间距排列。第一棵树到第四棵树的距离是 $60$ 英尺。第一棵树到最后一棵树之间的距离是多少英尺？

Six trees are equally spaced along one side of a straight road. The distance from the first tree to the fourth is $60$ feet. What is the distance in feet between the first and last trees?

$90$

$100$

$105$

$120$

$140$

答案：B

知识点：植树问题比与比例

难度评级：820

解答：

第一棵和第四棵之间有 $3$ 个间隔，因此每个间隔长 $60 \div 3 = 20$ 英尺。

第一棵和最后一棵之间有 $5$ 个间隔，所以它们相距 $5 \cdot 20 = 100$ 英尺。

所以正确答案是 B。

There are $3$ gaps between the first and fourth trees, which means that one gap is $60 \div 3 = 20$ feet long.

There are $5$ gaps between the first and last trees. This means that they are $5 \cdot 20 = 100$ feet apart.

Thus, B is the correct answer.

2001 AMC 8 第 6 题

答案：B

难度评级：820

解答：

其他年份的第 6 题