Answer:
150
Explanation:
Add the two extreme numbers and take the average
130 + 170 = 300
300/2 = 150
150 is 20 distant from 130 and also 20 distant from 170
middle number is 150
the middle of 130 - 170:
170 - 130 = 40
40/2 = 20
so the middle is:
130 + 20 = 150
or can be found:
170 - 20 = 150
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