Question is, what is the percentage mass of gold in an alloy that contains gold and silver only. Density of gold is 19,3g/cm^3 and of silver is 10.5g/cm^3. The volume of the alloy is 0.675cm^3 and the mass is 9.85g. And the volume of the alloy is the sum of the volume of the gold and the silver.

I get stuck pretty quickly, I am thinking about isolating the mass of the gold but i cant find the solution.

density of alloy = 9,85/0.675 = 14.6g/cm^3. Also i Know that x19.3 + y10.5 = 14.6. And that

14.6 = (mass gold + mass silver) / 0.675.

The answer is 60.6% but i don't see a way to get there. Thankful for any help that i can get.