A jar contains only red and blue marbles in a ratio of 7:4. If there are 20 blue marbles, how many red marbles are there?

Correct answer

A. 35

Explanation

The ratio 7:4 means for every 4 blue marbles there are 7 red. 20 blue ÷ 4 = 5 groups, so red marbles = 7 × 5 = 35.

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