Rho b = 0,9 gr/cm³
Rho f = 1 gr/cm³
Va = 7cm³
Vb?
Vf = Vb-Va = Vb-7
Vb x rho b = Vf x rho f
Vb x 0,9 = (Vb-7) x 1
0,9Vb = Vb -7
Vb - 0,9Vb = 7
0,1 Vb = 7
Vb = 7/0,1 = 70cm³
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Rho b = 0,9 gr/cm³
Rho f = 1 gr/cm³
Va = 7cm³
Vb?
Vf = Vb-Va = Vb-7
Vb x rho b = Vf x rho f
Vb x 0,9 = (Vb-7) x 1
0,9Vb = Vb -7
Vb - 0,9Vb = 7
0,1 Vb = 7
Vb = 7/0,1 = 70cm³