This Instructional Activity is a part of the Lesson 25, Unit 6, Grade 7. Two containers are shaped like right triangular prisms, each with the same height. The base area of the larger container is more than the base area of the smaller container. How many times must the smaller container be filled with water and poured into the larger container in order to fill the larger container? Students may feel more comfortable manipulating actual values for the dimensions of the prisms as done in the second solution to Example 2. Using sample values may be a necessary stepping stone to understanding how to manipulate the base area of one prism in terms of the other Let us call the area of the base of the smaller prism.