1998 AMC 8 Problem 14

Attempt Problem 14 of the 1998 AMC 8 below, then check your answer against the professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 1998 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

14.

At Annville Junior High School, 30%30\% of the students in the Math Club are in the Science Club, and 80%80\% of the students in the Science Club are in the Math Club. There are 1515 students in the Science Club. How many students are in the Math Club?
1212
1515
3030
3636
4040
Answer: E
Concepts:percentage
Small hint:
Find the number of students in both clubs first.
Big hint:
That overlap is 30%30\% of the Math Club.
Solution:
Since 80%80\% of the 1515 Science Club students are also in the Math Club, the two clubs overlap in 0.8⋅15=120.8\cdot 15=12 students. This is 30%30\% of the Math Club, so the Math Club has 120.3=40\dfrac{12}{0.3}=40 students.
Thus, the correct answer is E .
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