Question:
Jun Yang had 5 boxes each containing an equal number of apples and 7 empty boxes as shown below. He removed 21 apples from each of the 5 boxes and packed them into 7 empty boxes. After that, each of the 11 boxes had the same number apples except for the 12th box which had only 3 apples. How many apples were there in all the 12 boxes altogether?
Solution:
![P6 / ACS / 2018 / SA1 / Paper 2 – Q04 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/05/P6_SA1_2018_ACS_Paper2_Q04-Qns.jpg?resize=400%2C260&ssl=1)