Answer:
65
Explanation:
You want the midpoint of the interval 60 < x ≤ 70.
Midpoint
The midpoint is the average of the end points;
(60 +70)/2 = 65
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Additional comment
The left end of the interval exists only in the limit. There is no actual point you can identify as the left end of the interval. It is not 60, but is greater than 60. Similarly, the midpoint only exists as a limit. The difference between the midpoint and 65 can be made arbitrarily small, but it is never zero.
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