Marko has $$9$$ pieces of candy and Tomo has $$17$$ pieces of candy. How many pieces of candy does Tomo need to give to Marko so that each boy has the same number of pieces of candy? 
Overseas Competition->Knowledge Point->Word Problem Modules->Average Problems ->Giving and Receiving
Difference: $17-9=8$  Move: Half of $8=4$ 