Divid 33 photos into two groups so the ratio is 4 to 7

33 photos in a 4x to 7x ratio

4x + 7x = 33

11x = 33

x = 3

33 photos can be put in a 4 (3) to 7 (3) ratio

which is a 12 to 21 ratio

so 12 photos on one side, and 21 on the other side to get the ratio of 4 to 7

Note:

a (b) = ab = a x b = a times b

The answer for group

a=12

b=21

All you have to do to work this out is add the ratio (11) and see how many times the total (33) can be divided by it. So 33 divided by 11 = 3. So you times each ratio by 3.