AMC 8 1998 Problem 14
AMC8 1998 年第 14 题
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An Annville Junior High School, 30% of the students in the Math Club are in the Science Club, and 80% of the students in the Science Club are in the Math Club. There are 15 students in the Science Club. How many students are in the Math Club?
在 Annville 初中，数学俱乐部中 30% 的学生也在科学俱乐部，科学俱乐部中 80% 的学生也在数学俱乐部。科学俱乐部有 15 名学生。数学俱乐部有多少名学生？
- A.12
- B.15
- C.30
- D.36
- E.40
正确答案 · Correct Answer
E
解析 · Solution
Solution 1
If 80% of the people in the science club of 15 people are in the Math Club, people are in the both the Math Club and the Science Club.
These 12 people make up 30% of the Math Club.
Setting up a proportion:
,
There are 40=E people in the Math Club.
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