Question:
Mel has a total of 648 black and white buttons. He has 360 more black buttons than white buttons. He puts all the black buttons equally into empty black boxes and puts all the white buttons equally into empty white boxes. There are thrice as many black boxes as white boxes. Each black box contains 4 more buttons than each white box. How many buttons are there in each white box?
Solution:
![P6 / Henry Park / 2020 / SA2 Prelims / Paper 1 – Q29 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/08/P6_SA2_2020_Henry_Park_Paper1_Q29-Qns.jpg?resize=400%2C260&ssl=1)