For thousands of years, gold has been considered one of the Earth's most precious metals. One hundred percent pure gold is 24-karat gold, which is too soft to be made into jewelry. Most gold jewelry is 14-karat gold, approximately 58% gold. If 18-karat gold is 75% gold and 12-karat gold is 50% gold, how much of each should be used to make a 14-karat gold bracelet weighing 400 grams? How many grams of 18-karat gold needs to be used to make the bracelet? grams How many grams of 12-karat gold needs to be used to make the bracelet? grams