Answer is 2 Each rows total = 18 8+1+6+3 = 18 7+5+4+2 = 18 1+2+9+6 = 18 3+2+5+8 = 18 7+3+6+x = 18 So x= 18-16 = 2

What number should replace the question mark?

27 28 32 93 54 40 48 64 48 67 84 64 55 50 ?