tlng jawab dikumpul besok

rho = m/V
V = m/rho

Massa wadah = 30gr
Massa air = 80 - 30 = 50 gr
Massa zat cair x = 70 - 30 = 40 gr

pada air, rho = 1gr/cm³
V = (80-30)/1
V = 50 cm³

pada zat cair x,
volum zat cair = volum air = 50 cm³
rho = (70-30)/50
rho = 40/50
rho = 0,8 gr/cm³ 
rho = 0,8.(1000 kg/m³)
rho = 800 kg/m³

jawab (D)