1. Jewelry and tableware are sometimes made of sterling silver. Sterling silver is 92.5% silver (Ag) and 7.5% copper (Cu). If you wanted to make 30 grams of sterling silver for a ring, how many grams of silver and copper would you need to start with? 2. Some gold used for jewelry is called '18-karat white gold'. This alloy is 75% gold (Au), 12.5% silver (Ag), and 12.5% copper (Cu). If you wanted to make 25 grams of 18-karat white gold for a ring, how many grams of each metal would you need to start with?

3. In jewelry, 14-karat gold is not pure gold. It is actually 58% gold (Au), 4 to 28% silver (Ag) and 14 to 28% copper (Cu). When you buy a 10 gram ring, how many grams of gold are you really getting?

4. Solder is used for electronic connections and for making stained glass projects. Electronic solder is specifically 63% tin (Sn) and 37% lead (Pb). To make 75 grams of solder, how many grams of each metal would you need to start with?

5. Bronze is typically used for statues and castings. If a sample of bronze was created using 85% copper (Cu), 10% zinc (Zn), and 5% tin (Sn), how many grams of each metal are required for a 150 gram statue?