1997 AMC 8 第 13 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
13.
三袋软糖分别有 ， 和 颗。这三袋中黄色软糖所占比例分别为 、 和 。把三袋糖全部倒入一个碗中，黄色软糖占碗中所有软糖的比例最接近下列哪一个？
Three bags of jelly beans contain and beans. The ratios of yellow beans to all beans in each of these bags are and respectively. All three bags of candy are dumped into one bowl. Which of the following is closest to the ratio of yellow jelly beans to all beans in the bowl?
小提示：
用黄色软糖总数除以软糖总数
Divide total yellow beans by total beans
大提示：
先求每袋中黄色软糖的颗数
Find the number of yellow beans in each bag
解答：
第一袋中有 颗黄色软糖，第二袋中有 颗黄色软糖，第三袋中有 颗黄色软糖。
黄色软糖总数为 软糖总数为 黄色软糖所占的百分比为
所以正确答案是 A。
There are yellow jelly beans in the first bag, yellow jelly beans in the second bag, and yellow jelly beans in the third bag.
The total number of yellow jelly beans is and the total number of jelly beans is The ratio of yellow jelly beans to all the beans is
Thus, A is the correct answer.
其他年份的第 13 题
- 1985 AMC 8
- 1986 AMC 8
- 1987 AMC 8
- 1988 AMC 8
- 1989 AMC 8
- 1990 AMC 8
- 1991 AMC 8
- 1992 AMC 8
- 1993 AMC 8
- 1994 AMC 8
- 1995 AMC 8
- 1996 AMC 8
- 1998 AMC 8
- 1999 AMC 8
- 2000 AMC 8
- 2001 AMC 8
- 2002 AMC 8
- 2003 AMC 8
- 2004 AMC 8
- 2005 AMC 8
- 2006 AMC 8
- 2007 AMC 8
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