Question:
Calvin and Susie had some game cards at first. Calvin gave 1/4 of his cards to Susie. After that, Susie gave 1/5 of her cards to Calvin. In the end, Calvin had 45 cards and Susie had 36 cards. How many cards did Calvin have at first?
Solution:
![P6 / Tao Nan / 2019 / SA2 / Paper 2 – Q13 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/07/P6_Tao_Nan_2019_Prelims_Paper2_Q13-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Maris Stella / 2020 / SA2 Prelims / Paper 1 – Q21 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/12/P6_SA2_2020_Maris_Stella_Paper1_Q21-Qns.jpg?resize=400%2C260&ssl=1)