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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

A, B, C, and D are points on a line, with D the midpoint of segment line B C. The lengths of segments line A B, line A C, and line B C are 10, 2, and 12, respectively. What is the length of segment line A D?

(A) 2
(B) 4
(C) 6
(D) 10
(E) 12

答案和解析

答案：B

解析：

The key to this question lies in not jumping to incorrect conclusions. The question names the points on a line. It gives you a variety of information about the points. The one thing it does not do is tell you the order in which the points fall.