["Let total = 10u (hot 7u, cold 3u). Hot coffee = 4/7 of 7u = 4u, hot tea = 3u.","Cold coffee = 1/3 of 3u = u, cold tea = 2u.","Total coffee = 5u, total tea = 5u. Ratio = 5u : 5u = 1 : 1."]