Standard aluminum soft-drink cans do not vary in the amount of aluminum that they contain  Fifty percent of the aluminum contained in a certain group (M) of standard aluminum soft-drink cans was recycled from another group (L) of used, standard aluminum softdrink cans
Since all the cans in L were recycled into cans in M and since the amount of material other than aluminum in an aluminum can is negligible, it follows that M contains twice as many cans as L
All of the aluminum in an aluminum can is recovered when the can is recycled.