15 persons

1 ,2, 3, 4, 5, 6, Alok, Mohan, 9, 10, 11, 12, 13, 14, 15

If Kareem Khan is standing in a row of prisoners at 9th position from both end of a line. How many Prisoners are standing in total ?

x, y, z and k are four non zero positive integers satisfying 1/x + y/2 = z/3 + 4/k, minimum integral value of k for integral value of x, y and z will be