Ummi is setting up an aquarium in the shape shown here. 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?

Out of the 150 students at a summer camp, 72 signed up for canoeing. there were 23 students who signed up for trekking, and 13 of those students also signed up for canoeing. use a two-way table to organize the information and answer the following question: approximately what percentage of students signed up for neither canoeing nor trekking?