The volume of the box with dimensions 15 in by 15 in by 25 in is: 15*15*25 = 5625 cubic inches
1 ft is equivalent to 12 inches, then:
• 10 ft = 10*12 = 120 in
,
• 15 ft = 15*12 = 180 in
,
• 50 ft = 50*12 = 600 in
The volume of the container is 120*180*600 = 12960000 cubic inches
1 cubic foot is equivalent to 1728 cubic inches, then:
135 cubit ft = 135*1728 = 233280 cubic inches
Volume available in the container: 12960000 - 233280 = 12726720 cubic inches
Dividing the total available volume by the volume occupied by each box we get the number of boxes that fill the container.
12726720/5625 ≈ 2262 boxes