Question
A group of girls sold an average of 60 balloons at a carnival. Then 2 boys joined the group. The two boys sold a total of 165 balloons. After the two boys joined the group, the average number of balloons sold by all the boys and girls became 65. How many girls were there in the group?
Solution
![P6 / Temasek / 2019 / SA2 Prelims / Paper 2 – Q04 [2 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/06/P6_SA2_2019_Temasek_Paper2_Q04-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / Catholic High / 2020 / SA2 Prelims / Paper 2 – Q17 [5 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/06/P6_SA2_2020_Catholic_High_Paper2_Q17-Qns.jpg?resize=400%2C260&ssl=1)