A jar contains only red and blue marbles in a ratio of 2:3. If there are 15 blue marbles, how many red marbles are there?
- A. 15
- B. 10 ✓
- C. 25
- D. 12
Correct answer
B. 10
Explanation
The ratio 2:3 means for every 3 blue marbles there are 2 red. 15 blue ÷ 3 = 5 groups, so red marbles = 2 × 5 = 10.
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