The Recycling Factory

Dear Mr.Smith,
There is something wrong in the dump truck. You need to seperate the four materials in it Alumimim, soda cans, steel cans, milk jugs, soda bottles. Here's a way to seperate them.To seperate the four materials, I would take the net and put the same materials in one net. I would use the convayor belt to put everything on it, so that the magnet can attract each material closer, exposing the material. You can use the magnet to caputre the steel. Then you would be left with alumimum soda cans. milk jigs, and soda bottles. Next, I will pour all of them in water and see which one will float. Milk jugs will float since the density is less thank water. Then I only have to seperate aluminum soda cans and soda bottles. Next, I would pour both of then in to the concentrated sugar water and see which one will float. Concetrad sugar water has a density of 1.5 g/cm3. So soda bottles will float because the density of it is less than the concentrated sugar water. So all I am left with in the net is the aluminum soda cans.