Strangely, if the quality of gold and copper is equal, then the gold content of handicrafts must be less than 50%, because the density of gold is higher, and the volume of copper with the same quality must be more than that of gold. If the gold content is 50%, the quality of gold should be greater than that of copper. . . Contradiction, calculated according to the equal quality of gold and copper.

1, actual density: 600g/52cm3 =11.5g/cm3.

2. According to the salesman, the density of handicrafts should be: (19.3+8.9)/2 =14.1g/cm3, so the salesman lied.

3. If the actual gold content is xcm^3, the copper content is (52-x) cm 3. Available: 19.3*x+8.9*(52-x)=600. It is too much trouble to calculate the number of x=. Forget it. The linear equation can be solved. Final gold content =x/52