Question:
In a test, the average class score was 77 marks. Mr Lim discovered that he had recorded 14 students’ marks wrongly. After adding 3 marks to each of these students, the average class scores became 79. How many students were there in the class?
Solution:
![P6 / ACS (Junior) / 2021 / SA2 / Paper 2 – Q07 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/05/P6_SA2_2021_ACS_Junior_Paper2_Q07-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / ACS / 2018 / SA2 / Paper 2 – Q07 [3 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2019/07/P6_ACS_2018_Prelims_Paper2_Q07.jpg?resize=400%2C260&ssl=1)