What number is half of 11, plus half of 12, plus half of 13?

To find the result of half of 11 plus half of 12 plus half of 13, you can perform the following calculation:

$\frac{11}{2}+\frac{12}{2}+\frac{13}{2}$

Simplify each fraction:

$5.5+6+6.5$

Now, add the numbers together:

$5.5+6+6.5=18$

Therefore, half of 11 plus half of 12 plus half of 13 equals 18.