If z varies inversely as w, we have:
[tex]z=k\frac{1}{w}[/tex]Where k is constant
If, when z = 20, w = 0.7, we have:
[tex]\begin{gathered} 20=k\frac{1}{0.7} \\ k=20\cdot0.7 \\ k=14 \end{gathered}[/tex]Therefore, for w = 20, we have:
[tex]\begin{gathered} z=14\frac{1}{20} \\ z=0.7 \end{gathered}[/tex]
