4. An interior wall of a building is made up of metal studs with 5/8" gypsum board on each side. See the drawing below. If the actual width of a stud is 35/8", what is the total thickness of the wall?

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