If 3s + 1 < 2s < 9 - s, which of the following must be true?
I. -1 < s < 3
II. s < -1
III. s < 3 Choices:
A) II only  B) III only  C) I and II only  D) II and III only  E) I, II and III
Just try plugging s in a number like 0 or 1, and you'll quickly find that the inequality doesn't hold.   So you can immediately cross out any answers with I or III, leaving just (II only) II only.
<result>A</result>
If 3s + 1 < 2s < 9 - s, which of the following must be true?
I. -1 < s < 3
II. s < -1
III. s < 3