A jar contains only red and blue marbles in a ratio of 8:7. If there are 35 blue marbles, how many red marbles are there?
- A. 40 ✓
- B. 75
- C. 35
- D. 48
Correct answer
A. 40
Explanation
The ratio 8:7 means for every 7 blue marbles there are 8 red. 35 blue ÷ 7 = 5 groups, so red marbles = 8 × 5 = 40.
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