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Wysokość: 8/2 = 4 dm
akwarium ma: dno o wymiarach 8x5, 2 boki o wymiarach 8x4 i 2 boki o wymiarach 5x4 więc
8*5 = 40 dm^2
8*4 = 32 dm^2
4*5 = 20 dm^2
40+2*32+2*20 = 144 dm^2
11. A
Objętość: 5*8*4=160
120/3 = 40