Julia collects old watches. She owns 20 silver watches, and three times as many bronze watches. She decided to buy gold watches to add to her collection, a number that represents 10% of all the watches she owns. How many watches does Julia own after this purchase?
Julia owns 3 * 20 = 
<gadget id="calculator">3*20</gadget>
<output>60</output>
60 bronze watches.
60+20 = 
<gadget id="calculator">60+20</gadget>
<output>80</output>
80 total silver and bronze watches
10% of all Julia's watches is 80 * 10/100 = 
<gadget id="calculator">80*10/100</gadget>
<output>8</output>
8 watches, and she decided to buy so many gold watches.
So in total Julia is in possession of 20 + 60 + 8 = 
<gadget id="calculator">20+60+8</gadget>
<output>88</output>
88 watches.

<result>88</result>