How do you do dividing 33 photos into two groups at the ratio is 4 to 7?

If you have a problem with ratio, i would start with adding the numbers of the ratio, in our case:4+7=11

this means that the "whole" could be dividied into 11 parts, of which the first entity in the ratio has 4 and the other 7

since there are 33 photos, then each part is 33/11=3 photos.

so the two groups are 4*3=12

and

7*3=21

12 and 21 photos.