Answer:
9 large vests are sold and 12 small vests are sold
Step-by-step explanation:
the ratio is still equivalent so to get from 5 to 15 you multiply by 3 so you have to multiply 3 and 4 by 3 to to know how many vest the sports shop sold
3:5:4=?:15:?
5x3=15
3x3=9
4x3=12