Respuesta :

We will have that we will need the following number of boards:

We can see that each board can be used to obtain 6 two-foot braces.

So, we will need:

[tex]x=\frac{1\cdot20}{6}\Rightarrow x=\frac{10}{3}\Rightarrow x\approx3.33[/tex]

So, we will need 4 boards.