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There are 27 blue balls in the bag.
Step-by-step solution:
We're given that the ratio of red balls to blue balls is 1:3.
We know there are 9 red balls.
Let's set up a proportion:
Red : Blue = 1 : 3
9 : x = 1 : 3
If 1 part equals 9 red balls, then 3 parts will be 3 times as many.
So, x = 9 × 3 = 27
Therefore, there are 27 blue balls in the bag.