 
<translate> Otu ụlọ ahịa a na-ere mmiri ara ehi na-ere 50 x 2 / 5 = iko 20 nke mmiri ara ehi na-esi ísì ụtọ. Ha rere 50 x 3 / 10 = iko 15 nke Okinawa - tii mmiri ara ehi e mere ka ọ na - atọ ụtọ. Ya mere ha rere ngụkọta nke iko 20 + 15 = iko 35 nke melon oyi na Okinawa flavored milk tea. N'ihi ya, ha rere 50 - 35 = iko mmiri ara ehi 15 e ji chocolate mee. N'ihi ya, azịza ya bụ 15. <eng> 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. 