 
 <translate> A milk tea shop sold 50 x 2 / 5 = 20 cups of winter melon - flavored milk tea. They sold 50 x 3 / 10 = 15 cups of Okinawa - flavored milk tea. So they sold a total of 20 + 15 = 35 cups of winter melon and Okinawa flavors milk tea. Therefore, they sold 50 - 35 = 15 cups of chocolate - flavored milk tea.
Therefore, the answer is 15. <hau> Wani kantin sayar da shayi na madara ya sayar da 50 x 2 / 5 = kofuna 20 na ruwan shayi mai ruwan melon na hunturu. Sun sayar da 50 x 3 / 10 = kofuna 15 na Okinawa - shayi mai ƙanshi. Don haka sun sayar da jimillar 20 + 15 = kofuna 35 na dankalin turawa na hunturu da Okinawa mai dandano shayi mai madara. Saboda haka, sun sayar da 50 - 35 = kofuna 15 na shayi mai ɗanɗano na cakulan. Saboda haka, amsar ita ce 15. 