Question

That the whole question 3 what the answer and what do I do

Answer 1

The height of the boxes is 3" and the space between the shelves is 1.5 yds so:

1.5yds(36in/yd)(box/3in)=18 boxes.

Answer 2

I don't really know how to explain it, but I know it's 18.

Hope I helped, and good luck!