Question

Jack 有一袋 $128$ 个苹果。他先把其中的 $25\%$ 卖给 Jill。接着，他又把袋中剩余苹果的 $25\%$ 卖给 June。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 $128$ apples. He sold $25\%$ of them to Jill. Next he sold $25\%$ 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?

$7$

$63$

$65$

$71$

$111$

答案：D

知识点：百分数

难度评级：860

解答：

第一次卖掉 $25\%$ 后，剩下 $\frac{3}{4} \times 128 = 96$ 个苹果。第二次又卖掉余数的 $25\%$ ，剩下 $\frac{3}{4} \times 96 = 72$ 个苹果。

再送给老师 $1$ 个后，剩下 $72 - 1 = 71$ 个。

所以正确答案是 D。

After selling $25\%$ to Jill, Jack keeps $\frac{3}{4} \times 128 = 96$ apples. After selling $25\%$ of those to June, he keeps $\frac{3}{4} \times 96 = 72$ apples.

He then gives $1$ to his teacher, leaving $72 - 1 = 71.$

Thus, the correct answer is D .

1989 AMC 8 第 21 题

答案：D

难度评级：860

解答：

其他年份的第 21 题