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Given that 5 Canadian dollars are worth 4 US dollars, and that 9 Australian dollars are worth 7 US dollars, (i) How many Canadian dollars are there to 7 US dollars? (ii) How many Canadian Dollars are there to 1 Australian dollar? (iii) How many Australian dollars are there to 1 US dollar?

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Let's use the given exchange rates to answer these questions:

(i) To find out how many Canadian dollars are there to 7 US dollars:
- 5 Canadian dollars are worth 4 US dollars.
- So, 1 Canadian dollar is worth (4/5) US dollars.
- To find out how many Canadian dollars are there to 7 US dollars, you would multiply 7 by (4/5):
- 7 US dollars * (4/5) = 28/5 Canadian dollars
- Simplifying, you get 5.6 Canadian dollars.

(ii) To find out how many Canadian dollars are there to 1 Australian dollar:
- You have the exchange rate for Canadian to US dollars (5 CAD = 4 USD) and the exchange rate for Australian to US dollars (9 AUD = 7 USD).
- First, find the equivalent of 1 Australian dollar in US dollars by dividing 7 USD by 9 AUD: 7 USD / 9 AUD ≈ 0.7778 USD/AUD (rounded to four decimal places).
- Now, you already know that 1 Canadian dollar is worth (4/5) US dollars.
- To find how many Canadian dollars are there to 1 Australian dollar, divide (4/5) by 0.7778:
- (4/5) CAD / 0.7778 USD/AUD ≈ 1.0256 CAD/AUD (rounded to four decimal places).

(iii) To find out how many Australian dollars are there to 1 US dollar:
- You already found that 1 Australian dollar is approximately equal to 0.7778 US dollars.
- So, there are about 0.7778 Australian dollars to 1 US dollar.
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