There are $$28$$ boys and $$32$$ girls attending Think Academy holiday camp. They can be divided equally into groups (each group has a fixed number of boys and a fixed number of girls). What is the greatest number of groups that can be formed? 
Overseas Competition->Knowledge Point->Counting Modules->Permutations and Combinations->Combinations->Basic Operations of Combinations Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Addition and Subtraction 