The following method does not use a system of two or three equations but rather a work/mixture approach:

Since the volume of gold is twice the volume of the silver, we can use the ratio of 2G/1S to calculate the overall density.

The **d** of G is 19.3g/cc and the **d** of S is
10.5g/cc. So now I take 2G=2*19.3=38.6 and then add 10.5 to get a total
of 49.1g/cc.

But this is 3 times the total density, because we added the densities of two
golds and one silver. So, dividing 49.1 by 3, we get 16.36666... or,
rounding to two decimal places, **16.37 g/cc**.

Make sure not to confuse mass and weight. Weight takes into account the force of gravity; mass does not.

The volume of silver used in Bachelle's bracelet is 10cc and the volume of gold used is 20 cc.

As the density of gold is 19.3 g/cc, the weight of gold used in her bracelet is 19.3*20 = 386 g. As the density of silver is 10.5 g/cc, the weight of silver used in her bracelet is 10.5*10 = 105 g.

The total weight of her bracelet is 105 + 386 = 491 g

The volume of her bracelet is 10 + 20 = 30 cc

This allows us to find the density using the formula: density = mass/volume. The density of the bracelet is 491/30 = 16.36 g/cc

**The combined density of her bracelet is 16.36 g/cc**

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