A jar contains only red and blue marbles in a ratio of 3:9. If there are 72 blue marbles, how many red marbles are there?

Correct answer

C. 24

Explanation

The ratio 3:9 means for every 9 blue marbles there are 3 red. 72 blue ÷ 9 = 8 groups, so red marbles = 3 × 8 = 24.

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