A jar contains only red and blue marbles in a ratio of 6:4. If there are 12 blue marbles, how many red marbles are there?

Correct answer

D. 18

Explanation

The ratio 6:4 means for every 4 blue marbles there are 6 red. 12 blue ÷ 4 = 3 groups, so red marbles = 6 × 3 = 18.

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