The number of students enrolled in a college is shown in the following table. Science Arts Commerce Vocational  Girls   Boys   Girls   Boys   Girls   Boys   Girls  Boys  35 18 25 47 45 40 10 30 The ratio of the total number of boys to that of girls in the college is:

13 : 42 1 : 1 23 : 27 27 : 23

27 : 23

Total number of Boys  :  Total number of Girls ( 18 + 47 + 40 + 30 )  :  ( 35 + 25 + 45 + 10 )              135               :             115                27               :              23