(a)　How many groups are there if 12 is divided into groups of:[br]　　(i) 3; 　(ii) 4;　(iii) 5?[br](b)　How many groups are there if 10 is divided into groups of 4?[br](c)　How many groups are there if 5 is divided into groups of 3?[br](d)　How many groups are there if 3 is divided into groups of 5?[br](e)　How many groups are there if 2 is divided into groups of 4?[br](f)　How many groups are there if 1 is divided into groups of 3?[br][br]In general, how would you calculate a ÷ b ?