A jar contains only red and blue marbles in a ratio of 9:2. If there are 16 blue marbles, how many red marbles are there?

Correct answer

A. 72

Explanation

The ratio 9:2 means for every 2 blue marbles there are 9 red. 16 blue ÷ 2 = 8 groups, so red marbles = 9 × 8 = 72.

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