http://www.youtube.com/watch?v=Gf_Jk1zLisg
This is a 1978 commercial; showing how ratio's in advertising date back. The Advertisement says that "4 out of 5 dentists recommend sugarless gum for their patients who chew gum". This is a ration of 4:5. This means for every 5 dentists questioned 4 recommend sugarless gum.
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