In order to find the number, let's translate the sentence into an equation:
[tex]\frac{1}{4}=\frac{x}{20}[/tex]Then, let's solve the equation for x:
[tex]\begin{gathered} x\cdot4=1\cdot20 \\ 4x=20 \\ x=\frac{20}{4} \\ x=5 \end{gathered}[/tex]So the number is 5.