Hi I'm Murder, I'm the kind of guy that likes to know the mechanics behind the game and doesn't mind doing a bit of research.  
	Today we will be looking at combat levels, how each combat stat affects your combat level and therefore whats the fastest way to combat up. I know alot of people will claim training defense is the fastest way to combat up, well Kappa in the chat boys because this is a load of bullshit.  
	Combat stat      -      combat gained     -     levels required to get a combat level
 
	Range/Mage     -             0.5              -                    2
 
	Att/Str             -            0.33             -                    3
 
	Hp/Def             -           0.25              -                   4
 
	Prayer              -           0.125             -                   8  
	Now obviously only your highest offensive stat will affect your combat (mage/range/melee) 
	To avoid confusement melee = (att + str)/ 1.5      ie. 50 mage = 75 melee stats ( like 30 attack, 45 str)  
	Now if you disagree with any of these numbers feel free to drop a comment, but I think they are all right as -> https://youtu.be/l2CCAsnz_g4?t=59s