Answer:
Mitch bought 5 buckets of wings
Explanation:
y=# of wings
X= # of pizza
X+Y=13
X = 13 - Y
11.75X + 19.95Y = 193.75
11.75(13 - Y) + 19.95Y = 193.75
152.75 - 11.75Y + 19.95Y = 193.75
152.75 + 8.2Y = 193.75
8.2Y = 41
Y = 5
Mitch bought 5 buckets of wings