Initial data: a (brick length) = 250 mm; b (brick width) = 120 mm; c (brick thickness) = 65 mm; m (brick mass) = 3.6 kg.
SI system: a = 250 mm = 0.25 m; b = 120 mm = 0.12 m; s = 65 mm = 0.065 m.
1) Calculate the volume of the brick:
V = a * b * c = 0.25 * 0.12 * 0.065 = 0.00195 m ^ 3.
2) Find the density of the brick:
ρ = m / V = 3.6 / 0.00195 = 1846 kg / m ^ 3.
Answer: The required brick density is 1846 kg / m ^ 3.
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