A jar contains only red and blue marbles in a ratio of 3:4. If there are 8 blue marbles, how many red marbles are there?

Correct answer

B. 6

Explanation

The ratio 3:4 means for every 4 blue marbles there are 3 red. 8 blue ÷ 4 = 2 groups, so red marbles = 3 × 2 = 6.

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