Question: According to official figures, how many died in the flood of 1957?
Sentence: The Francoist administrations of Valencia silenced publicity of the catastrophic consequences of the floods of 1949 with the attendant dozens of deaths, but could not do the same after the even more tragic flood of 1957 when the river Turia overflowed its banks again, killing many Valencians (officially, eighty-one died; the actual figure is not known).
Answer in sentence: yes