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## Homework Statement

A cube of metal(density=6.00 kg/dm^3) has a cavity inside it. It weighs 2.40 times as much in air as it does when completely submerged in water. What fraction of the cube's volume is the cavity?

## Homework Equations

Density=m/v

Fb=Density of fluid times volume of fluid times g

F=mg

## The Attempt at a Solution

I first made two equations:

Density=m/v (for water) Density=m/v

6.00 kg/dm^3=m/1000 kg 6.00 kg/dm^3/2.40m/V

Idk what 2 do from there because I think I set the equations up wrong could someone please explain 2 me what I should do because what's really bugging me is the amount of information that is given to me?