3) (11 1/2)*12 area of the one type of the wall, there are 2 such walls (11 1/2)*12*2 (8 1/3)*12 area of the second type of the wall, there are 2 such walls (8 1/3)*12 *2
Altogether area of the walls: (11 1/2)*12*2 + (8 1/3)*12 *2=12*2(11 1/2 + 8 1/3)= =24(19+3/6+2/6)=24(19+5/6) = 456 +24*(5/6)= 456+20= 476
Tamara needs total 476 square feet, which is less than 480 square feet, so she has enough paint.