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To determine which party has more crust, we need to calculate the total circumference of crust for each party.
For the first neighbor:
Each large pizza has a circumference of π x 16 inches = 16π inches.
Therefore, the total circumference of crust for 5 large pizzas would be 5 x 16π = 80π inches.
For the second neighbor:
Each small pizza has a circumference of π x 12 inches = 12π inches.
Therefore, the total circumference of crust for 9 small pizzas would be 9 x 12π = 108π inches.
Since 108π inches of crust is greater than 80π inches of crust, the second neighbor's party has more crust.