A jar contains only red and blue marbles in a ratio of 9:3. If there are 18 blue marbles, how many red marbles are there?
- A. 72
- B. 54 ✓
- C. 63
- D. 18
Correct answer
B. 54
Explanation
The ratio 9:3 means for every 3 blue marbles there are 9 red. 18 blue ÷ 3 = 6 groups, so red marbles = 9 × 6 = 54.
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