SOLUTION: A bracelet that is supposed to be 18-karat gold weighs 238 grams. The volume of the bracelet is 15 cubic centimeters. The bracelet is made of gold and copper. Gold weighs 19.3 gram

Algebra ->  Coordinate-system -> SOLUTION: A bracelet that is supposed to be 18-karat gold weighs 238 grams. The volume of the bracelet is 15 cubic centimeters. The bracelet is made of gold and copper. Gold weighs 19.3 gram      Log On


   

Question 180586: A bracelet that is supposed to be 18-karat gold weighs 238 grams. The volume of the bracelet is 15 cubic centimeters. The bracelet is made of gold and copper. Gold weighs 19.3 grams per cubic centimeter, and copper weighs 9 grams per cubic centimeter. Is the bracelet really 18-karat gold ?

Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
If the bracelet were 100% gold, it would weigh Weight+=+Volume+%2A+grams%2Fcc
Using the info given in the problem, the volume is 15cc and gold weighs 19.3g/cc
Thus Weight+=+15+%2A+19.3 = 289.5 for a pure gold bracelet. This one is only 238. So it is 'less than 18k gold'