📅 MIT Science Bowl 2022🎓 HS🔄 Round 1#️⃣ Question 20🌟 BONUS✍️ Short Answer
The math, science, and history classes at a school each have 35 students. Every pair of classes has exactly 9 students in common, and there are 3 students in all three classes. How many students are in at least one of the three classes?
✔️Answer:81
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