A jar contains only red and blue marbles in a ratio of 2:4. If there are 24 blue marbles, how many red marbles are there?

Correct answer

D. 12

Explanation

The ratio 2:4 means for every 4 blue marbles there are 2 red. 24 blue ÷ 4 = 6 groups, so red marbles = 2 × 6 = 12.

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