18! You would divide 12 by 2 since that's the number of red dots per blue. Then multiply by three and there's the answer!
I think it would be 18 ;
To maintain the ratio of 2 drops of red to 3 drops of blue food coloring, you need 18 drops of blue food coloring for 12 drops of red food coloring. This is done by setting up a proportion and solving for the unknown. The calculated amount ensures the icing remains purple as intended.
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