At dinner, Mom tells Alice to take knifes and forks out of the cupboard and put it on each plate. It is known that there are six plates, four forks, and six knives. How many forks or knives does Alice need to get out of the cupboard ?~ (adapted from $$2011$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$6$$) 
Overseas Competition->Knowledge Point->Word Problem Modules->Applying Addition and Subtraction->Including and Excluding 
Each plate needs a knife and a fork. There are six plates here, so $6$$\times$1$=6$pairs of knives and forks are required, that is, six knives and six forks. But now there are only four forks. $6-4=2$ forks are required. 