 <translate> 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?
Thoughts? Step-by-step reasoning: <yor> Julia máa ń kó àwọn aago àtijọ́ jọ. Ó ní aago fàdákà ogún, ó sì tún ní aago idẹ ní ìlọ́po mẹ́ta. Ó pinnu láti ra àwọn aago wúrà láti fi kún àkójọpọ̀ rẹ̀, iye tí ó dúró fún 10% gbogbo àwọn aago tí ó ní. Wákàtí mélòó ni Julia ní lẹ́yìn tí ó rà á? Ṣé o ní èrò kan? Àlàyé tó ṣe ṣísẹ̀-n-tẹ̀lé: 