Question 1164649
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The response from the other tutor is exceedingly long and wordy, making it hard to follow.<br>
In the last few lines of that response, he gets to the basic process of converting units.<br>
To change units without changing a measurement, multiply by a "unit fraction" in which the numerator and denominator are equal measurements but in different units.<br>
For a simple example....<br><pre>
            12 inches   4*12
   4 feet * --------- = ---- = 48 inches
             1 foot      1</pre>
The units "cancel"  resulting in a measurement in different units.<br>
In this problem, you are given the value of 100 Euros in several currencies.  So the ratio of any two of those numbers is a unit fraction.<br>
(1) 45 pounds in rubles: multiply by rubles/pounds<br><pre>
                4239 rubles
   45 pounds * ------------
                89.9 pounds</pre>
(2) 100 Australia dollars in Euros: multiply by Euros/Australia dollars<br><pre>
                                   100 Euros
   100 Australian dollars * ------------------------
                            143.2 Australian dollars</pre>
(3) 48 Australian dollars in US dollars: multiply by US dollars/Australian dollars<br><pre>
                                133.8 US dollars
    48 Australian dollars * ------------------------
                            143.2 Australian dollars</pre>
You can do the calculations.<br>