Question 4666
Area is found by multiplying height by width:
Two walls are 9' high x 9' wide and two walls are 9'high x 12' wide

(2*9*9) + (2*9*12) = 162+216 = 378 square feet  (2 gallons are needed) = $32
Room 2
Same process

Walls: (2*9*14)+(2*9*16) = 540 sq. feet (2 gallons are needed) = $32

Room 3

walls: (2*9*12)+(2*9*14) = 468 square feet (2 gallons are needed) = $32

Total for house = $32*3=$96