Determine what percentage of the chain is gold, by mass, to at least 1 decimal place?

Question

The water level was 15 milliliters before adding the chain, and 20 milliliters after adding the chain. When I weighed the chain, its mass was 66.3 grams.

I believe the chain is solid metal (not gold plated), but is probably a blend of gold and other metals. I looked up that gold has a density of 19.3 g/ml, while the other metals like silver and copper usually blended with gold have a combined density of about 9.7 g/ml.

Determine what percentage of the chain is gold, by mass, to at least 1 decimal place?

 

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My answers are x=.371 which equals 37.1% which is the gold content
and y=.629 which equals 62.9% which is the other content

When I used 37.1% for the answer it was said it was wrong. Am I messing the equations up?

Answer 1

Anthony, I don't think you have given us enough information to answer the question.  We would need to know the volume of the water displaced, not the change in depth of the water.