Given that, 11/4 feet of string is need to make to holiday ornaments and assume x feet of string is needed to make 16 holiday ornaments.
[tex]\begin{gathered} \frac{\frac{11}{4}}{x}=\frac{20}{16} \\ \frac{11}{4x}=\frac{5}{4} \\ \frac{x}{11}=\frac{1}{5} \\ x=\frac{11}{5} \end{gathered}[/tex]Therefore, 11/5 feet of string is needed to make 16 ornaments.