Mathematics · Ratio and Proportion
A bag contains some red marbles and the rest are blue marbles. If one red marble is removed from the bag, the ratio of the number of red marbles to blue marbles becomes 1 : 3. If instead, two blue marbles are removed from the total marbles, the ratio of the number of red marbles to the remaining blue marbles becomes 3 : 4. How many blue marbles are there in the bag?
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