I) The total number of lone pairs at all the atoms in hex halides of sulphur is a
II) The total number of lone pairs in `O_(3)` is b
III) The total number of lone pairs in `H_(2)S_(2)O_(8)` is c
IV) Bond order in `O_(3)` is d
Then what is `[(a+b+c)/(10)+2d]`