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ρₓ = 0,9 gr/cm³
ρₐ = 1 gr/cm³
Vₜ / V = __?

Vₜ = (ρₓ / ρₐ) V
Vₜ / V = (ρₓ / ρₐ)
Vₜ / V = 0,9 /1
Vₜ / V = 0,9 = 90% ✓