Question:
The average mass of Ahmad, Brian, Caili and Devi is 38 kg.
The average mass of Ahmad, Brian and Caili is 37 kg while the total mass of Caili and Devi is 77 kg.
a) Find Caili’s mass.
b) Brian and Devi have the same mass. Find Ahmad’s mass.
Solution:
![P6 / Catholic High / 2020 / SA2 Prelims / Paper 1 – Q05 [1 mark]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2021/06/P6_SA2_2020_Catholic_High_Paper1_Q05-Qns.jpg?resize=400%2C260&ssl=1)
![P6 / ACS (Junior) / 2021 / SA2 Prelims / Paper 1 – Q17 [1 mark]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2022/05/P6_SA2_2021_ACS_Junior_Paper1_Q17-Qns.jpg?resize=400%2C144&ssl=1)