A jar contains only red and blue marbles in a ratio of 9:6. If there are 18 blue marbles, how many red marbles are there?
- A. 45
- B. 36
- C. 18
- D. 27 ✓
Correct answer
D. 27
Explanation
The ratio 9:6 means for every 6 blue marbles there are 9 red. 18 blue ÷ 6 = 3 groups, so red marbles = 9 × 3 = 27.
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