"Haibao" is the mascot of the 2010 World Expo. Among all kinds of "Haibao" dotted on the streets of Shanghai, one "Haibao" has a volume of 2 cubic meters and a density of 1.5 times 10 kilograms per cubic meter. The quality of this "Haibao" is calculated
Mass equals volume times density, 2 * 1.5 * 10 = 30