3 : 4 = 28
3+4 parts = 28
1 part = 28/7
1 part= 4
(Calculation of [3 + 4 ] is to get the [total of parts] that represent as 28 cans of soda)
Next,[ 28 should be divide by 7] (4 +3) to get [one part] represent how many cans of soda.
3 parts=
3 x 4
12
4 parts =
4 x4
16
([3 and 4 should be multiply with '4'] (28/7) to get [how many cans of soda that represent the ratio])
