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## Homework Statement

A meteorological balloon has volume of 20.0 m3 and a weight of 10.5 kg (gas included).

The density of the air is 1.18 kg/m3 and acceleration of gravity 9.81 m/s2

## Homework Equations

What amount of cargo in kg can the balloon lift?

## The Attempt at a Solution

Can you please advise about the starting point, it has certainly something to do with the density of air.

I'm using the principle PV=nRT but it's not taking me any further