Allysa spent $60 to purchase 15 chickens. She bought two
different types of chickens. Americana chickens cost $3.25 each
and Delaware chickens cost $4.50 each. Write a system of
equations that can be used to determine the number of Americana
chickens, A, and the number of Delaware chickens, D, she
purchased. Determine algebraically how many of each type of
chicken Allysa purchased.