How many acts are in both  Lucia di Lammermoor and La buona figliuola?
Lucia di Lammermoor: Lucia di Lammermoor is a "dramma tragico" (tragic opera) in three acts by Gaetano Donizetti. La buona figliuola: La buona figliuola ("The Good-Natured Girl" or "The Accomplish'd Maid"), or La Cecchina ("Cecchina"), is an opera buffa in three acts by Niccolò Piccinni.
i don't know