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?
How many bronze watches does Julia own? ** Julia owns 3 * 20 = <<3*20=60>>60 bronze watches.
How many watches does Julia own? ** 60+20 = <<60+20=80>>80 total silver and bronze watches
How many gold watches does Julia buy? ** 10% of all Julia's watches is 80 * 10/100 = <<80*10/100=8>>8 watches, and she decided to buy so many gold watches.
How many watches does Julia own after this purchase? ** So in total Julia is in possession of 20 + 60 + 8 = <<20+60+8=88>>88 watches.
#### 88