Pakai cara yaaa!!!! nmr 30,31

30. volume = 1/2 × 6 cm × 8 cm × 12 cm
volume = 24 cm2 × 12 cm
volume = 288 cm3 (jawaban B)

31. volume akuarium:
= 15 dm × 5 dm × 10 dm
= 750 dm3

volume kubus = 2,5 dm× 2,5 dm ×2,5 dm
volume kubus = 15,625 dm3

banyaknya pemindahan air =
750 dm3 ÷ 15,625 dm3 = 48 kali
(jawaban C)