There are $$10$$ blind boxes on the desk, and each blind box contains two toys. Now there are $$16$$ toys in hands. How many blind boxes remain？(adapted from $$2010$$ Math Kangaroo Problem, Level $$1-2$$, Question \#$$15$$) 
Overseas Competition->Knowledge Point->Word Problem Modules->Unitary Method Problems->Finding the Total Value using Unitary Method
$$16$$ toys means $$8$$ blind boxes are opened.  There are $$10$$-$$8$$=$$2$$ blind boxes that have not been opened. 