The width of the brick is 6(1.25)=7.5 inches, and its height is 6−2=4 inches. The brick's volume is thenlwh=(6)(7.5)(4)=180 cubic inches. Since 1 kg=1000 grams, the brick's mass is 5,850 grams. Finally, the brick's density is  volume  mass ​=180 in 35,850 grams ​=32.5 grams per cubic inch.