Total number of pounds of garbage = 25 pounds.
Total number of plastic in 25 pounds of garbage = 16 pounds.
We need to find the percentage of plastic contain in total number of pounds of garbage.
<em>In order to find the percentage of the 16 pounds of plastic in 25 pounds of garbage, we need to divide 16 by 25 and then finally multiply by 100.</em>

On dividing 16 by 25 we get 0.64.
Now, we need to multiply 0.64 by 100, we get 64.
<h3>Therefore, 64 % of the garbage are plastic.</h3>