In the enchanted garden of the Green King, there are apple trees that grow golden apples. Every day, $$5$$ golden apples become ripe on each tree, and at the end of each day they fall from the trees. Today, the Green Gardener has picked up $$20$$ ripe apples that fell under the trees last night. How many enchanted trees are there in the garden?（$$2005$$ Math Kangaroo Problem, Levels $$1-2$$, Question \#$$1$$） 
Overseas Competition->Knowledge Point->Word Problem Modules->Unitary Method Problems->Applying Multiplication and Division
$$5$$ apples fall down from each trees. "Each"~is a sign of division. So, the answer is $$20\div5=4$$. 