mass gold+mass quartz=13.3
massgold/densitygold+massquartz/densityquartz=3.56E-3
you have two equations, two unknowns, solve for mass gold
A gold prospector finds a solid rock that is composed solely of quartz and gold. The mass and volume of the rock are, respectively, 13.3 kg and 3.56 × 10-3 m3. The density of gold is 19 300 kg/m3, and the density of quartz is 2660 kg/m3. Find the mass of the gold in the rock.
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