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90 - 70 = vol batu
volume batu = 20ml
20ml=20cm3
20cm3= 20 x 10^-6 m3
massa batu = 120 g
120g = 0,12 kg
massa jenis = m/v
massa jenis = 0,12 / 20 x 10^-6
massa jenis = 6000 kg/m3