A jar contains only red and blue marbles in a ratio of 4:2. If there are 8 blue marbles, how many red marbles are there?

Correct answer

B. 16

Explanation

The ratio 4:2 means for every 2 blue marbles there are 4 red. 8 blue ÷ 2 = 4 groups, so red marbles = 4 × 4 = 16.

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