rank film year opening weekend
(three day) inflation-adjusted
(2014 usd)
rank
film
year
opening weekend -lrb- three day -rrb-
inflation adjusted -lrb- 2014 usd -rrb-
number
number
number
number
number text number unitnum unitnum
1 marvel's the avengers 2012 $207,438,708 $213,091,480
what is the average opening weekend gross between iron man 3 and the dark knight ?
WP VBD-AUX DT JJ NN NN JJ IN NN NN CD CC DT JJ NN .
$166,278,034
select avg ( c4_number ) from w where c2 in ( 'iron man 3' , 'the dark knight' )