A jar contains only red and blue marbles in a ratio of 6:3. If there are 18 blue marbles, how many red marbles are there?

Correct answer

D. 36

Explanation

The ratio 6:3 means for every 3 blue marbles there are 6 red. 18 blue ÷ 3 = 6 groups, so red marbles = 6 × 6 = 36.

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