15
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20
It is: 50
The fraction halfway between 2/5 and 9/10 is 13/20
(10-20)/2 = -10/2 = negative 5
-5 It is 15 more than -20 and 15 less than 10 To find a halfway point (which is also the average), add the numbers together and divide by 2. -20 + 10 = -10 and -10/2 = -5