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?
Let's be accurate as possible. Think before you answer.
88
Julia owns 3 * 20 = 60 bronze watches.

60 + 20 = 80 total silver and bronze watches.

10% of all Julia's watches is 80 * 10 / 100 = 8 watches, and she decided to buy so many gold watches.

So in total Julia is in possession of 20 + 60 + 8 = 88 watches.

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The answer: 88