A golden-colored cube is handed to you. The person wants you to buy it for 60 thousand, saying that it is a gold nugget. You pull out your old geology text and look up gold in the mineral table, and read that its density is 19.3g/cm​.You measure the cube and find that it is 2 cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it?