Jawabanmu

2014-05-11T11:29:16+07:00
Fa = W
rho air. vbf . g = mb . g
rho air . vbf = rho benda . vb
1 . vbf       = 0.8 (0.75 + vbf)
     vbf       = 0,6 + 0.8 vbf
   0,2vbf    = 0,6
       vbf   = 3

Vbenda seluruhnya = 3 +0,75 = 3,75cm³
2014-05-11T12:13:57+07:00
Fa = W
rho air. vbf . g = mb . g
rho air . vbf = rho benda . vb
vbf       = 0.8 (0.75 + vbf)
vbf       = 0,6 + 0.8 vbf
0,2vbf   = 0,6
vbf       = 3

Vbenda seluruhnya = 3 +0,75 = 3,75cm³
semoga membantu ... :D