Arya, Abhimanyu, and Vivek shared lunch. Arya has brought two sandwiches, one made of vegetable and one of jam. The other two boys forgot to bring their lunch. Arya agreed to share his sandwiches so that each person will have an equal share of each sandwich.
$(a)$ How can Arya divide his sandwiches so that each person has an equal share?
$(b)$ What part of a sandwich will each boy receive?