实际问题解答

有三个集邮册。A中有全部的2/10，B中有不知道是全部的七分之几，C中有303张，问邮票总数和各册的邮票数？
            int i,a,b;
            float s=0,n;
            for (i = 1; i <= 7;i++ )
            {
                n = 1 - 2 / 10 - i / 7;
                s = 303 / n;
                if (s % 1 == 0)
                {
                    Console.WriteLine("总数为{0}", s);
                    break;
                }
            }
            a = (int)s * (2 / 10);
            Console.WriteLine("A有{0}", a);
            b = (int)s - a - 303;
            Console.WriteLine("B有{0}", b);
            Console.WriteLine("C有303");
            Console.ReadKey();
我很好奇我哪里错了，请前辈指教！！！