This Problem Set is a part of the Lesson 9, Unit 8, Grade 6. A preschool teacher is rearranging four boxes of playing blocks so that each box contains an equal number of blocks. Currently Box 1 has 32 blocks, Box 2 has 18, Box 3 has 41, and Box 4 has 9. Select all the ways he could make each box have the same number of blocks.