Answer:
9 buttons in package 34
Explanation:
There are 26 buttons in each box.
26 * 33 = 858 for the first 33 full boxes
867 - 858 = 9 buttons in the 34th box
B = buttons per box
33*B<867 --> B < 26.27
34*B>867 --> B > 25.5
So 25.5 < B < 26.27, therefore B = 26 buttons per box