Question:
A box contained red and blue pens. After another 60 red pens were added to the box, the percentage of red pens increased from 30% to 45%. How many blue pens were there in the box?
Solution:
Empowering Students and Parents with Solutions
![P6 / ACS / 2020 / SA2 / Paper 2 – Q17 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/09/P6_ACS_2020_SA2_Paper2_Q17-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Maha Bodhi / 2019 / SA1 / Paper 2 – Q01 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/04/P6_MahaBodhi_2019_SA1_Paper2_Q01-Qns.jpg?resize=400%2C260&ssl=1)