Respuesta :

Grp 1: Grp 2
4       :       7
 
Total no. of untis= 11
11units=33
1unit= 3
Grp 1= 3 x 4 
          = 12
Grp 2= 7 x 3
         = 21

ratio is 4 to 7

so for every 4 photos in the first group there is 7 photos in the 2nd group

4+7 = 11

33/11 = 3

 3*4 = 12 first group

3*7 = 21 second group