Question

驴 Henry 有一根很长的意大利面。他咬了若干口，每次都从某一段意大利面的中间吃掉 $3$ 英寸。最后他有 $10$ 段意大利面，总长度为 $17$ 英寸。他最开始的那根意大利面长多少英寸？

Henry the donkey has a very long piece of pasta. He takes a number of bites of pasta, each time eating $3$ inches of pasta from the middle of one piece. In the end, he has $10$ pieces of pasta whose total length is $17$ inches. How long, in inches, was the piece of pasta he started with?

$34$

$38$

$41$

$44$

$47$

答案：D

知识点：不变量

难度评级：1020

解答：

从一整段变成 $10$ 段，需要咬 $9$ 口。咬了 $9$ 口，每口吃掉 $3$ 英寸，所以共吃掉 $27$ 英寸。

已经吃掉 $27$ 英寸，最后还剩 $17$ 英寸，因此原长为 $27+17 = 44$ 英寸。

正确答案是 D。

Since there are $10$ pieces, there were $9$ locations where a bite was made. Since we have $9$ bites and $3$ inches are removed per bite, a total of $27$ inches were removed.

With $27$ inches removed and $17$ inches remaining, we know we started with $27+17 = 44$ inches.

Thus, the correct answer is D.

2022 AMC 8 第 11 题

答案：D

难度评级：1020

解答：

其他年份的第 11 题