Mr Abdul made tuna and curry fillings for some puffs. 3/5 of the filling he made was tuna and the rest was curry potato. After he used 1/8 kg of the tuna filing and made another 3/4 kg of curry potato filling, he then had equal amounts of tuna filling and curry potato filling left. How much tuna filling did he make at first? Give your answer as a mixed number in its simplest form.