22
(13+31)/2
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19
It is: (13+41)/2 = 27
To find the number between two other numbers be find their mean or average. To do this we add the numbers and divide by the number of numbers we have, 2 in this case.13+6= 1919/2= 9.59.5 (that's nine and a half) is midway between six and thirteen.
0.75 ---------------the halfway number
18.8 (By the way, the number halfway between is also the "average" of the two numbers.)