Answer:
Volume of the shaded space = 4480.0 yd³
Explanation:
Volume of the shaded space = Volume of cuboid - Volume of Pyramid placed inside
Volume of cuboid = Length × Width × Height
 = 28 × 12 × 20
 = 6720 yd³
Volume of pyramid = 

 = 

 = 2240 yd³
Volume of the shaded space = 6720 - 2240
 = 4480.0 yd³