In a certain country, a part of the residents can speak English only, a part can speak French only and the rest can speak both languages. It is known that $$85\textbackslash\%$$ residents can speak English and $$75\textbackslash\%$$ can speak French. What percent of the residents of this country can speak both English and French? ($$2002$$ Math kangaroo Problem, Level $$7-8$$, Question \#$$17$$) 
选项为:A:$$50\textbackslash\%$$  B:$$57\textbackslash\%$$  C:$$25\textbackslash\%$$  D:$$60\textbackslash\%$$  E:$$40\textbackslash\%$$  请回答其中一个选项.