A jar contains only red and blue marbles in a ratio of 2:4. If there are 12 blue marbles, how many red marbles are there?
- A. 6 ✓
- B. 18
- C. 12
- D. 8
Correct answer
A. 6
Explanation
The ratio 2:4 means for every 4 blue marbles there are 2 red. 12 blue ÷ 4 = 3 groups, so red marbles = 2 × 3 = 6.
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