Question:
The teacher told the class that the average marks for a test was 82 marks.
However, Nicole was absent for the test.
The table below shows the average marks before Nicole took the test.
After Nicole has taken the test, the teacher changed the average marks for the girls and announced that the final average marks for the class was 82.5 marks.
(a) How many marks did Nicole score for the test?
(b) What was the average marks scored by the girls finally?
Give your answer correct to 1 decimal place.
Solution:
![P6 / Nanyang / 2020 / SA2 Prelims / Paper 2 – Q17 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/11/P6_Nanyang_2020_SA2_Paper2_Q17-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / CHIJ / 2019 / SA2 / Paper 2 – Q17 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/06/P6_CHIJ_2019_Prelims_Paper2_Q17-Qns.jpg?resize=400%2C260&ssl=1)