A jar contains only red and blue marbles in a ratio of 2:5. If there are 10 blue marbles, how many red marbles are there?

Correct answer

B. 4

Explanation

The ratio 2:5 means for every 5 blue marbles there are 2 red. 10 blue ÷ 5 = 2 groups, so red marbles = 2 × 2 = 4.

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