Michelle baked 3 trays of bite sized macaroons. The first tray has 72 pieces, the second fray has 36 pieces, and the third tray has 24 pieces. Which are packed of equal numbers in a box. Find the greatest number of macaroons be packed in a box.
16. Understand: ________________________________________________________________
17. Plan: ______________________________________________________________________
18. Solve: _____________________________________________________________________
19. Check: ____________________________________________________________________
20. Answer: ___________________________________________________________________​