Question:
For a scrapbook-making course, each participant was given some buttons. Each adult received 10 buttons. Each girl received 5 buttons and each boy recevied 4 buttons. The ratio of the number of girls to the number of boys was 7 : 4. Half of the total number of participants was adults. The participants received a total of 3381 buttons. How many participants were there at the course?
Solution:
![P6 / Nanyang / 2019 / CA1 / Paper 1 – Q19 [1 mark]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/04/P6_CA1_2019_Nanyang_Paper1_Q19-Qns.jpg?resize=400%2C175&ssl=1)
![P6 / ACS / 2018 / SA1 / Paper 1 – Q22 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/04/P6_SA1_2018_ACS_Paper1_Q22-Qns.jpg?resize=400%2C260&ssl=1)