A jar contains only red and blue marbles in a ratio of 7:2. If there are 12 blue marbles, how many red marbles are there?
- A. 49
- B. 12
- C. 54
- D. 42 ✓
Correct answer
D. 42
Explanation
The ratio 7:2 means for every 2 blue marbles there are 7 red. 12 blue ÷ 2 = 6 groups, so red marbles = 7 × 6 = 42.
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