A jar contains only red and blue marbles in a ratio of 5:4. If there are 20 blue marbles, how many red marbles are there?

Correct answer

D. 25

Explanation

The ratio 5:4 means for every 4 blue marbles there are 5 red. 20 blue ÷ 4 = 5 groups, so red marbles = 5 × 5 = 25.

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