Science Bowl Question

📅 NSB Round Robin 2009🎓 HS🔄 Round 5#️⃣ Question 18❓ TOSS-UP✍️ Short Answer

A jar of 100 marbles contains only 2 colors of marbles, red and blue. If there are 13 red marbles for every 12 blue marbles, how many blue marbles are in the jar?

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