If one Australian dollar is worth 0.25 U.S dollars, then one U.S dollar is worth how many Australian dollars?

Question

BlackTom AI · Accepted Answer

The problem gives a simple exchange rate: 1 Australian dollar (AUD) is worth 0.25 U.S. dollars (USD). 
To find how many Australian dollars equal 1 U.S. dollar, we need to invert the exchange rate. If 1 AUD = 0.25 USD, then 1 USD equals 1 / 0.25 AUD. 
Calculating 1 / 0.25 is the same as 1 ÷ 0.25 = 4. 
Hence, 1 USD is equivalent to 4 AUD. 
The reasoning hinges on inverting the rate because you’re swapping the base and quote currencies from AUD per USD to USD per AUD. 
In general, when you have a rate a/b (where a units of currency X are worth b units of currency Y), the inverse b/a gives how many units of X you need for 1 unit of Y.

If one Australian dollar is worth 0.25 U.S dollars, then one U.S dollar is worth how many Australian dollars?

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