The volume of a big square is: the area of a face: 54/6=9. Area of a square: 9=3*3. The first cube: 3 * 3 = 27. Area of surface: 96/6= 16. The area of a square: 16=4*4. The second cube 4. 6=25 square area: 25=5*5 The third cube: 5 * 5 = 125 Cube volume: 27+64+ 125=2 16 Because the cube volume =2 16, according to the calculation formula of the cube, we get Thank you for your adoption!