ranked games

My thoughts on this matter is I think its stupid, how is it that my friend and me play ranked together she wins 7-10 and I win 6-10 I get bronze 1 and she gets silver 2 how the f*** don't that work. People need to fix this problem or I see me along with other people getting pissed off and quitting this game I love it but that is f***ing retarted (Fix this issue).