A lumberjack is chopping down trees so he can sell firewood. Each tree he chops produces 4 logs each, and each log is then chopped into 5 pieces of firewood. If the lumberjack has chopped 500 pieces of firewood, how many trees did he chop down?
The firewood is made from 500 pieces of firewood / 5 pieces of firewood per log = <<500/5=100>>100 logs.
So the logs are chopped from 100 logs / 4 logs per tree = <<100/4=25>>25 trees.
#### 25