Question:
A set of numbers is written on a board. If the number 34 is added to the set of numbers, the average will increase by 1. If the number 58 is added to the original set of numbers, the average will increase by 4. How many numbers are written on the board?
Solution:
![P6 / Nan Hua / 2021 / SA2 /
Paper 1 – Q21 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/08/P6_SA2_2021_Nan_Hua_Paper1_Q21-Qns.jpg?resize=397%2C249&ssl=1)
![P6 / Methodist Girls / 2020 / SA2 Prelims / Paper 2 – Q04 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/09/P6_Methodist_Girls_2020_SA2_Paper2_Q04-Qns.jpg?resize=400%2C260&ssl=1)