A jar contains only red and blue marbles in a ratio of 7:5. If there are 20 blue marbles, how many red marbles are there?

Correct answer

B. 28

Explanation

The ratio 7:5 means for every 5 blue marbles there are 7 red. 20 blue ÷ 5 = 4 groups, so red marbles = 7 × 4 = 28.

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