The answer depends on what you mean by 11 in(n) a half - which is not an expression that is recognised.
41
11 and 1 fourth
9/10 + ½ =9/10 + 2/10 = 11/10 = 1⅒
9 + 22 + 11 = 42
(-9) + (-11-4) + (-11-63) =-9 - 11 - 4 - 11 - 63 = -98
10+11+9+3= 33
11 + 7 + 9 = 27
11 + 11 + 11 + 10 + 9 + 9 + 9 + 8 + 8 + 8 + 8 + 8 + 8 + 7 + 2 = 127
9 plus 11 (20) plus 15 (35) plus 18 is equal to 53
-20
2 + 2 + 9 = 13
12+8+10+12+11+9 = 62
1/2 + 7/22 = 11/22 + 7/22 18/22 9/11.