A hot air balloon holds 3,249 cubic meters of helium. The density of helium is 0.1785 kilograms per cubic meter. How many kilograms of helium does the balloon contain, rounded to the nearest tenth of a kilogram?

1,873.4 kg

2,194.6 kg

2,721.2 kg

579.9 kg

We find the answer by using the density formula: d = m/v

We know the density: 0.1785

We know the volume: 3,249

We DO NOT know the mass, so that is what we're trying to finding

0.1785 = m/3,249

Solve:

3,249 * 0.1785 = m/3,249 * 3,249

579.9465 which can be rounded to 579.9

The answer is D.