A jar contains only red and blue marbles in a ratio of 7:9. If there are 18 blue marbles, how many red marbles are there?
- A. 32
- B. 14 ✓
- C. 21
- D. 18
Correct answer
B. 14
Explanation
The ratio 7:9 means for every 9 blue marbles there are 7 red. 18 blue ÷ 9 = 2 groups, so red marbles = 7 × 2 = 14.
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