Since McKenzie fills the 2-quart pitcher 2 times, there are a total of 4 quarts.
2 quarts × 2 times filled = 4 quarts
Recall that
1 quart = 4 cups
Since each quart is 4 cups, having 4 quarts is equivalent to
4 quarts × 4 = 16 cups
Therefore, there are a total of 16 cups of juice that was made.