A student receives 6 points for each question answered correctly, 1.5 points for each question left blank, and no points for incorrect answers. Thus, a student who answers 18 correctly, leaves 5 blank, and misses 2 gets 18×6 + 5×1.5 = 115.5 points. The maximum possible score is 6×25 = 150 points; in 2006, the AMC 12 had a total of 17 perfect scores between its two administrations, while the AMC 10 had 89.