1mark 2019 ACS CA1 P6 P6 / ACS / 2019 / CA1 – Q01 [1 mark] Question: Simplify 5a – 10 – 2a + 15. Solution: Similar Posts P6 / CHIJ / 2020 / SA2 Prelims / Paper 1 – Q02 [1 mark] P6 / Singapore Chinese Girls / 2019 / SA1 / Paper 2 – Q10 [3 marks]