-5
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-12.5
5 It is 15 more than -10 and 15 less than +20. To find the halfway point (the average), add the two numbers and divide by 2. -10 + 20 = 10 divided by 2 = 5
It has to be 7/10. 3/5 is 6/10. 4/5 is 8/10, therefore 7 is exactly between 6 and 8
10
8.5