A jar contains only red and blue marbles in a ratio of 5:9. If there are 36 blue marbles, how many red marbles are there?

Correct answer

D. 20

Explanation

The ratio 5:9 means for every 9 blue marbles there are 5 red. 36 blue ÷ 9 = 4 groups, so red marbles = 5 × 4 = 20.

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