A jar contains only red and blue marbles in a ratio of 8:3. If there are 21 blue marbles, how many red marbles are there?
- A. 64
- B. 77
- C. 56 ✓
- D. 21
Correct answer
C. 56
Explanation
The ratio 8:3 means for every 3 blue marbles there are 8 red. 21 blue ÷ 3 = 7 groups, so red marbles = 8 × 7 = 56.
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