Hi there!
I'm unsure if '11/4 pounds' meant '1/4', however, if it did, the answer is 6 pies in total.
Here's how I worked it out:
9 - 1.5 = 7.5 ( 1 )
7.5 - 1.5 = 6 ( 2 )
6 - 1.5 = 4.5 ( 3 )
4.5 - 1.5 = 3 ( 4 )
3 - 1.5 = 1.5 ( 5 )
1.5 - 1.5 = 0 ( 6 )
Hope I helped! (: