Bunuel wrote:
In a certain game, a player can accumulate points only by scoring either an X, which counts 3 points, or a Y, which counts 2 points. If a player scored 24 points in the game and t points were made by scoring X's, how many different values could t have?
A. Four
B. Five
C. Six
D. Seven
E. Eight
PS20410
So, if X's are worth 3 points and Y's are worth 2 points, then the
TOTAL points = 3X + 2Y (where X and Y represent the number of X's and Y's scored, respectively)
So, we want to determine the number of different
integer solutions to
3X + 2Y = 24Let's list them in the form (X, Y):
(0, 12)
(2, 9)
(4, 6)
(6, 3)
(8, 0)
So, X can equal 0, 2, 4, 6, or 8, then t can equal 0, 6, 12, 18 or 24
Answer: B
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Brent Hanneson – Creator of gmatprepnow.com
