The following bar graph shows the number of patients visiting a hospital on different days of a certain week.

Calculate the ratio of the total number of patients visiting the hospital on Monday or Wednesday to the number of patients visiting the hospital on Friday. (Note: None of the patients visited the hospital on more than one day during the given week.]

283 : 179

Total number of patients visiting hospital on Monday and Wednesday  :  Number of patient visiting hospital on Friday

 ( 145 + 138)  :     179

        283        :     179