I need help on this one question I am stuck on it.

Given:
8.90ft³ for 30 balloons
Let h be the volume of helium and b be the number of balloons.
Using proportion;
b/h = 30 /8.90
Multiply both-side by h
[tex]\frac{b}{h}\times h=\frac{30}{8.90}\times h[/tex][tex]b=\frac{30}{8.90}h[/tex]Hence, the answer to blank 1 is the above.
when b=50, substitute for b in the above and solve for the volume (h).
That is;
[tex]50=\frac{30}{8.90}h[/tex]Multiply both-side by 8.90/30
[tex]50\times\frac{8.90}{30}=h[/tex][tex]14.83=h[/tex]Hence, the answer to blank 2 is 14.83ft³.