Answer: 1 australian dollar = 0.972 Canadian dollars
Explanation:
Given that 5 canadian dollars are worth 4 us dollars, it means that the worth of 1 US dollars would be
5/4 = 1.25 canadian dollars.
Given that 9 australian dollars are worth 7 us dollars, it means the worth of 1 Us dollars would be 9/7 australian dollars.
This means that 1.25 canadian dollars = 9/7 australian dollars.
Therefore,
1 australian dollar would be equal to
1.25 × 7/9 = 0.972 Canadian dollars