For the following reaction :
`N_(2)O_(5)(g)+O_(2)(g)overset(40%)rarr2NO_(2)(g)+O_(3)(g)`
`NO_(2)(g)+O_(2)(g)overset(50%)rarrNO(g)+O_(3)(g)`
If initially 20 moles of `N_(2)O_(5)` and 30 moles of `O_(2)` are taken then calculate sum of moles of `O_(2)` and `O_(3)` after the reaction.
A. 16
B. 21
C. 27
D. 30