P6 / Tao Nan / 2019 / SA1 / Paper 2 – Q09 [3 marks]

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: