In the Lewis structure of ozone with one double bond and one single bond (formal charges $+1$ on the central atom and $-1$ on one terminal atom), the total number of lone pairs on all three oxygen atoms is

Ozone has 18 valence electrons. The double-bonded terminal O has 2 lone pairs, the central O has 1, and the singly bonded terminal O${}^{-}$ has 3. The total is $2+1+3=6$ lone pairs (12 electrons) plus 3 bonding pairs (6 electrons).