An alloy of tin and copper contains 16% tin. how much tin (to the nearest tenth) must be added to make 820 pounds of alloy that is 18% tin?

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car