Calculate Balloon Volume from Helium Mass: 199 kg

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The total mass of helium in a balloon is 199 kg. What is the volume of the balloon? Enter only the numeric portion of the answer, not the units.

That is the problem. I am having trouble locating a simple formula for this. All I can seem to find involve having the radius of the balloon which I do not have. In the book it says each cubic foot of helium can lift .069 lb, so this may play a factor but I am unsure of how exactly. I have thought about converting 199KG to lbs and dividing by .069. Is this thinking correct?
 
on Phys.org
Helium = 0.179 so maybe I can take 199kg times .179 and that 35.621 kg is this correct?
 

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