Answer:he needs 1 7/8 gallons of milk to make 30 milkshakes and this is a proportional relationship
Step-by-step explanation:3/4 divided by 12 =1/16 so it takes 1/16 gallon to make 1 milkshake and 1/16x30= 1 7/8 gallons to make 30 milkshakes it’s proportional because 3:4 >15:8