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

Question

In the video, 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 76.3 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?

I need step by step help with solving the problem, I can't seem to get the equation correct for x and y I ended up with 2.13 and for y 2.87, even when I multiplied each by 100 my answer was still incorrect

Answer 1

I've done this problem with a necklace I bought years ago

you are calculating a density of. 3.86 grams /ml. I got something similar . I asked a clerk in a jewelry

store and he said all those gold chains are hollow.