1. 11.32
2. 69.12
Hope it helps
Well, volume is: length x width x height
so, 5 x 14 x 8= 560 inches
Check the picture below
if that red segment, GJ, is parallel to the AE base segment of the triangle, then, the segment GJ is the midsegment of the triangle, and by the side-splitter theorem, those two triangles are similar.
28÷1.5=18.67
meaning that more, than 17 discs can be placed in the box.