Question:
In January, the ratio of the number of butterflies to the number of bees in a garden was 7 : 3. In February, the butterfly population decreased by 20% while the bee population increased by 30%.
a) What was the percentage change in the combined butterfly and bee population?
b) If there were 168 butterflies left in February, what was the butterfly population in January?
Solution:
![P6 / Singapore Chinese Girls / 2019 / SA1 / Paper 2 – Q15 [4 marks]](https://i0.wp.com/sgprimaths.com/wp-content/uploads/2020/05/P6_Singapore_Chinese_Girls_2019_SA1_Paper2_Q15-Qns.jpg?resize=400%2C260&ssl=1)
