In order to calculate how many containers will be needed, we can use a rule of three:
[tex]\begin{gathered} 1\text{ container}\to0.55\text{ pounds of soil} \\ x\text{ containers}\to3.3\text{ pounds of soil} \\ \\ \frac{1}{x}=\frac{0.55}{3.3} \\ x=\frac{3.3}{0.55} \\ x=6 \end{gathered}[/tex]So it will be needed 6 containers.