That would be a really wide textbook. Most of them are going to run between 8 and 12 inches.
The unit you are probably looking for is centimeters.
A book could be 25 cm wide (about 10 inches).
25 inches
There are: 69*36*25 = 2,509 cubic inches
25 inches wide
The volume of 25 inches times 15 inches times 10 inches is 3750 cubic inches.
25mm = about 0.984 inches.
7,500
Depends on the textbook. For example, my math book is only about five inches, but my Geography book on the other hand is twice the size. Overall, it's the subject and authors that really factor in.
The volume (capacity) of that tank is13" x 31" x 25" = 10,075 cubic inches = 43.615gallons (rounded)
37.1527 square feet.
26.65 cu .ft.
325 square inches
This dumbbell racks actual dimensions are 30" x 16" x 22" ; the 25" is referring to the width of the space that accommodates the actual dumbbells for storage.