Question

To decorate a cake, you make a shade of purple icing using 2 drops of red food coloring for every 3 drops of blue. For 12 drops of red food coloring, how many drops of blue food coloring would you need?

Answer 1

36 is your answer to your question 

Answer 2

Ratio of red to blue food coloring = 2/3
It would be proportional to each value.

So, 2/3 = 12/x
x = 12/2 * 3
x = 6 * 3
x = 18

In short, Your Answer would be 18 Drops

Hope this helps!