A jar contains only red and blue marbles in a ratio of 6:7. If there are 49 blue marbles, how many red marbles are there?

Correct answer

B. 42

Explanation

The ratio 6:7 means for every 7 blue marbles there are 6 red. 49 blue ÷ 7 = 7 groups, so red marbles = 6 × 7 = 42.

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