Number of lone pair present on central atom in `XeF_2,XeO_2,XeO_2F_2,XeO_3`?

The number of lone pairs on central atom in XeF_2, XeF_4 and XeF_6 are:

Which of the following number of lone pair at central atom zero. XeO_(3),XeO_(2)F_(2),XeO_(4),XeO_(3)F_(2),Ba_(2)XeF_(4)

The ratio of number of lone pairs on central atom in ammonia, Water and XeF_2 are

The number of lone pairs of electrons on central atom of H_(2)O,SnCl_(2),PCl_(3)and XeF_(2) respectively are:

Total number of lone pairs on Xe in XeF_(2), XeO_(3)F_(2), XeF_(4), XeF_(6) is t,u,v & w respectively. Then

The number of bond pairs is X and lone pairs is Y on Xe (central atom) in XeO_(3)F_(2) . What is the sum of X+Y ?