How much of a perfume that sells for $35 dollar per ounce should be mixed with a perfume that sells for $15 per ounce to make a 3-oz bottle of perfume that can be sold for $63? amount of $35 perfume=?

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint