GMAT Prep Math (DS)

[chris8888]

If P, Q, and R are points on the number line, what is the distance between P and R?

(1). Q is between P and R.

(2). The distance between P and Q is 5.

答案是E,

我認為是C,

搞不懂

[chris8888]

我自問自答好了,

我看錯了, 我以為Q is between P and R 是表示在正中央, 錯了, 只是在其間罷了. = ='''

答案確實是E.