Question:
The figure below shows a grey cube and a white cube. The length of each edge of the grey cube is twice that of the white cube. Xin Neng wants to use 5 grey cubes and the least number of white cubes to build a new cube.
(a) How many white cubes does Xin Neng need to build the new cube?
(b) Given that the volume of the new cube is 1728 cm³, find the length of the edge of the white cube.
Solution:
![P6 / Ai Tong / 2019 / SA2 / Paper 2 – Q12 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/06/P6_Ai_Tong_2019_Prelims_Paper2_Q12-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Singapore Chinese Girls / 2019 / SA2 / Paper 2 – Q14 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/07/P6_SCGS_2019_Prelims_Paper2_Q14-Qns.jpg?resize=400%2C260&ssl=1)