Clancy and his friends bought vanilla wafers for $3 per packet and chocolate wafers for $1 per packet at a carnival. They spent a total of $20 to buy a total of 9 packets of wafers of the two varieties. Part A: Write a system of equations that can be solved to find the number of packets of vanilla wafers and the number of packets of chocolate wafers that Clancy and his friends bought at the carnival. Make sure you say what each variable means! (Which one is which wafer type?) (5 points) Part B: How many packets of chocolate wafers and vanilla wafers did they buy? Explain how you got the answer and why you selected a particular method to get the answer. (5 points)