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Answer:
To find the ratio of red marbles to total marbles, we need to divide the number of red marbles by the total number of marbles.
Given information:
Ratio of red marbles to total marbles:
Ratio = Number of red marbles / Total number of marbles
Ratio = 12 / 36
To simplify the ratio, we can divide both the numerator and the denominator by their greatest common divisor, which is 12:
Ratio = 12 / 36 = 1 / 3
So, the ratio of red marbles to total marbles is 1:3 or 1/3.