20
It is: 50
The fraction halfway between 2/5 and 9/10 is 13/20
40
(10-20)/2 = -10/2 = negative 5
20
-5
30
It is: 15
It is 20
It is: 50
17
The fraction halfway between 2/5 and 9/10 is 13/20
the number between 2 and 20 is 11
-5
It is: (20+80)/2 = 50
40