Question

A hot air balloon holds 4,328 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?

3,747.9 kg
3,875.3 kg
772.5 kg
4,383.2 kg

Answer 1

Density = mass/volume

Density is 0.1785 kg/m^3
Volume is 4328 m^3
Mass is ??

We need to solve for mass

Answer 2

mass = density* volume

Answer 3

0.1785 = x / 4328

if you multiply 4328 on both sides, what do you get?

That's going to be the mass in kilograms

Answer 4

Or just do 4328 * 0.1785 = ? / since mass = density* volume

Answer 5

4328 * 0.1785

Answer 6

I got " 772.5 kg"

Answer 7

Perfect !

Answer 8

That's correct!