The Memory Test

Doctor : “What is three times three?”
Person 1 : 274
The doctor rolls his eyes and looks up at the ceiling, and asks the second man, “It’s your turn. What is three times three?”
Person 2 :”Tuesday,”
The doctor shakes his head sadly, then asks the third man, “Okay, your turn. What’s three times three?”
Person 3 : “Nine”
Doctor : “That’s great! How did you get that?”
Person 3 : “Simple just subtract 274 from Tuesday.”