59. The points A, B, C, and D lie in that order on a straight line. The midpoint of AC is B, and the midpoint of AD is C. The length of AB is x inches, and the length of CD is 3x - 6 inches. What is the length, in inches, of AD？
Your Answer is
Correct Answer is A
Explanation
2x=3x-6, so the value of x is 6, AD=24. Choose A.