1989 AMC 8 第 21 题
先试着解答 1989 AMC 8 第 21 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 1989 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
21.
杰克有一袋 个苹果。他先把其中的 卖给吉尔。接着，他又把袋中剩余苹果的 卖给琼。之后，他把袋中剩下的苹果中最亮的一个送给了老师。最后袋中还剩多少个苹果？
Jack had a bag of apples. He sold of them to Jill. Next he sold of those remaining to June. Of those apples still in his bag, he gave the shiniest one to his teacher. How many apples did Jack have then?
答案：D
小提示：
卖掉 后会剩下
Selling leaves of the apples
大提示：
把 连续乘以 两次，然后再减去送给老师的那个苹果
Multiply by twice, then subtract the one given to the teacher
解答：
杰克第一次卖掉 后，剩下 个苹果。第二次又卖掉余数的 ，剩下 个苹果。
再送给老师 个后，剩下 个。
所以正确答案是 D。
After selling to Jill, Jack keeps apples. After selling of those to June, he keeps apples.
He then gives to his teacher, leaving
Thus, the correct answer is D .
其他年份的第 21 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
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