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 / SCGS / 2021 / SA2 / Paper 1 – Q28 [2 marks] Reader Submission #55](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/07/ReaderSub_55-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Henry Park / 2021 / SA2 / Paper 1 –
Q10 [1 mark]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/06/P6_SA2_2021_Henry_Park_Paper1_Q10-Qns.jpg?resize=400%2C260&ssl=1)