Determine the average density for a 7030 copperzinc alloy 70

Determine the average density for a 70/30 copper-zinc alloy. 70 wt% Cu and 30 wt% Zn in units of grams/cm^3

Density of copper is 8.96g/cm^3 if 100g of copper is taken

If 70 g copper is taken then density is 8.96×70/100=6.272g/cm^3

Density of 100g zinc is 7.13g/cm^3

So density of 30g Zinc is 7.13×30/100=2.139g/cm^3

Hence average density =6.272+2.139/2

Average density is 4.2055g/cm^3