Ummi is setting up an aquarium in the shape shown here. (Length = 3 ft, Width =

Ummi is setting up an aquarium in the shape shown here. (Length = 3 ft, Width = 2 1/2 ft) She fills it partially with water. The volume of the water is 15 ft³. Then she adds more water to the aquarium. Now the volume of the water is 22 1/2 ft³? How much does the level of the water rise when Ummi adds more water? Show your work.