Answer:
x = 12
Explanation:
Definition of a point between two points:
Point B is between points A and C if and only if AB + BC = AC.
Now we apply it to this problem.
AB = 3x + 5
BC = 2x + 3
AC = 68
AB + BC = AC
Substitute each segment length with the expression or length above. Then, solve the equation for x.
3x + 5 + 2x + 3 = 68
5x + 8 = 68
5x = 60
x = 12