A jar contains only red and blue marbles in a ratio of 8:3. If there are 15 blue marbles, how many red marbles are there?
- A. 15
- B. 55
- C. 40 ✓
- D. 48
Correct answer
C. 40
Explanation
The ratio 8:3 means for every 3 blue marbles there are 8 red. 15 blue ÷ 3 = 5 groups, so red marbles = 8 × 5 = 40.
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