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On Monday, Nicole spent $780 on fifty-two collector’s comic books. She then returned to the comic book store on Tuesday and purchased eight more comics. Was the mean price she paid per book more than $20?

(1) Each of the comic books she purchased on Tuesday cost more than $30.

(2) Each of the comic books she purchased on Tuesday cost less than $40.

Official solution from Veritas Prep.

The correct response is (B). The average is equal to the sum of terms divided by the number of terms. Here, the question is asking whether ($780 + price of the 8 additional) / 60 > $20, or (780 + x) / 60 > 20. Simplifying, we need to know whether the 8 additional comic books summed to more or less than $420. From Statement (1), if each comic book was more than $30, then all we know is that the 8 additional comic books summed to more than $240. That could be a value less than or greater than $420. Insufficient.

From Statement (2), if each comic book was less than $40, then the sum of the 8 additional comic book was less than $320. Since $320 is less than $420, this is sufficient.
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