What is the density of an alloy made of 2cm3 gold and 5cm3 silver.

If we take the entire mass of the resulting alloy as 1 (7 parts), then
– the share of gold will be (2/7) * 100% = 28.57%.
– the share of silver will be (5/7) * 100% = 71.43%.
Density of the manufactured alloy:
ρ = ρ1 * 0.2857 + ρ2 * 0.7143, where ρ1 is the density of gold (ρ1 = 19300 kg / m³), ρ2 is the density of silver (ρ2 = 10500 kg / m³).
ρ = 19300 * 0.2857 + 10500 * 0.7143 ≈ 13000 kg / m³.
Answer: The density of the alloy produced is 13000 kg / m³.