2019 AMC 8 Problem 11

Attempt Problem 11 of the 2019 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2019 AMC 8 solutions, or check the answer key.

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

11.

The eighth grade class at Lincoln Middle School has 9393 students. Each student takes a math class or a foreign language class or both. There are 7070 eighth graders taking a math class, and there are 5454 eighth graders taking a foreign language class. How many eighth graders take only a math class and not a foreign language class?
1616
2323
3131
3939
7070
Answer: D
Concepts:inclusion-exclusionVenn Diagram
Small hint:
First find how many students are counted twice
Big hint:
Only math = math total minus both classes
Video solution:
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Written solution:
The number of kids that are taking both classes is 70+54−93=31. 70 + 54 - 93 = 31. Subtracting this from the number of kids taking a math class will give us the number of kids taking only a math class.
The desired number is 70−31=39.70 - 31 = 39.
Thus, the correct answer is D.
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