16 sq ft = 2 ft x 8 ft
4 ft x 4 ft
but..
4 ft x 4 ft x 4 ft = 64 cubic ft
So 4 cannot be the height of this crate.
h represents the height of the crate (defined variable)
2 ft x 8 ft x h = 48 cubic ft
16h = 48
h = 3 ft
The height of the crate is 3 feet.
Check:
2 ft x 8 ft x 3 ft = 48 ft ³