'; (a)
Volume of one wooden cuboid
= 28 x 7 x 9
= 1764 cm³

Volume of two wooden cuboids
= 2 x 1764
= 3528 cm³

Volume of 1-cm cube
= 1 x 1 x 1
= 1 cm³

Number of 1-cm cubes that Oscar got
= 3528 ÷ 1
= 3528

(b)
Volume of the vertical cuboid with none of its faces painted white
= (9 - 1 - 1) x (7 - 1 - 1) x (28 - 1)
= 7 x 5 x 27
= 945 cm³

Volume of the horizontal cuboid with none of its faces painted white
= (28 - 1 - 1) x (7 - 1 - 1) x (9 - 1 - 1)
= 26 x 5 x 7
= 910 cm³

Volume of the connecting cuboid that with none of its faces painted white
= (9 - 1) x (7 - 1 - 1) x 1
= 8 x 5 x 1
= 40 cm³

Total volume that had none of its faces painted white
= 945 + 910 + 40
= 1895 cm³

Number of cubes that had none of its faces painted white
= 1895 ÷ 1
= 1895

Answer(s): (a) 3528; (b) 1895