The given data shows the number of mobiles (in thousands) manufactured by companies C-1, C-2, C-3 and C-4 in 2017, 2018 and 2019.

What is the ratio of total products manufactured by C-1 to that of C-4?

32 : 31

Total Manufacturing of mobile in C-1  :  Total Manufacturing of mobile in C-4

( 59 + 65 + 68 )  :  ( 59 + 62 + 65 )

         192           :            186

           32           :              31