Arectangle has side lengths (2x-5) meters and (2x+6) meters. write and simplify an expression to represent the perimeter of the rectangle

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