Sorry KR... I know about it.. and that is the correct answer... you might be looking just for a different representation of the same solution.. this is very simple question .. if x is larger part .. y is smaller.. and z is the total length.. then x/z=x/y which is x2-zy... assuming z = 100% of line... x = 10 y... which is x = 91.91% and y = 9.09%... sorry.. the answer can not be incorrect