A jar contains only red and blue marbles in a ratio of 5:3. If there are 21 blue marbles, how many red marbles are there?

Correct answer

B. 35

Explanation

The ratio 5:3 means for every 3 blue marbles there are 5 red. 21 blue ÷ 3 = 7 groups, so red marbles = 5 × 7 = 35.

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