A jar contains only red and blue marbles in a ratio of 9:7. If there are 49 blue marbles, how many red marbles are there?

Correct answer

D. 63

Explanation

The ratio 9:7 means for every 7 blue marbles there are 9 red. 49 blue ÷ 7 = 7 groups, so red marbles = 9 × 7 = 63.

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