Using proportions, given the density value, it is found that the ballons contain 9.8 kilograms of helium.
A proportion is a fraction of a total amount.
In this problem, we have that each ballon contain 0.14 kilograms per cubic meter.
You get 5 ballons, each with 14 cubic meters, hence the total volume is given by:
V = 5 x 14 = 70 m³.
Applying the density, we have that the total mass is given by:
M = 0.14 x 70 = 9.8 kilograms.
More can be learned about proportions at https://brainly.com/question/14398287
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