1. The problem statement, all variables and given/known data An 18 carat gold ring is made from an alloy containing 75% gold with small amounts of other metals including copper and silver. By considering the ring to be a cylinder, find an order of magnitude estimate for the mass of the ring. 2. Relevant equations density of gold - 19.32g per cubic cm Density = Mass/Volume 3. The attempt at a solution I am not quite sure about what it means by treating it as a cylinder. Does it mean to imagine cutting the ring and flattening it out to form a straight line which resemble a cylinder? I really have no idea how to go about this. I guess you would then use mass = density x volume where you use the volume of a cylinder. What is the best way to go about finding approximate dimensions of a ring without having one?