Answer:
Distance = 11
Explanation:
Number Line is the straight line in which every point shows real numbers. It can show numbers between (-∞,∞).
Thus there are 11 points between 12 and 23, which are:
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23.
Distance = 23 - 12 = 11