KöMaL 2017 K542

A shop sells a certain souvenir for 1100 forints (HUF, Hungarian currency). A tourist from an exotic country wants to buy one by paying for it with the currency of his own country. In his country, there are three kinds of coins: round, triangular and square. 11 round coins are worth exactly 1500 forints, 11 square coins are worth 1600 forints, and 11 triangular coins are worth 1700 forints. How many of each type of coin should the tourist hand over in order to pay the exact price of 1100 forints? Find all possible answers.