How many balloons would it take to lift an object?

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Like what's the equation?
 
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moonman239 said:
Like what's the equation?

We know gravity is ~10 meters a second per second downward. So, if I had an object of mass M the force needed to keep an object up in the air would be M*10. Now, the only question is how much force does one balloon produce in the upward direction?

Edit: beaten