2020 2marks Nan Hua P6 Paper1 SA2 P6 / Nan Hua / 2020 / SA2 Prelims / Paper 1 – Q11 [2 marks] Question: The average mass of 3 boys are 32 kg. When a 4th boy joined the group, the average mass of 4 boys was 33 kg. What was the mass of the 4th boy? Solution: Similar Posts P6 / River Valley / 2019 / SA2 / Paper 2 – Q10 [3 marks] P6 / Rosyth / 2020 / SA2 Prelims / Paper 2 – Q16 [5 marks]