Voldemort: Now, we shall begin the class. Well, for starters, we will revise the previous Algebra lesson. Have you all finished the homework? The semester exam is on the horizon, you had better get down to studying seriously now. Back to the lesson, can anyone tell me the answer of this problem: divide 550 by 2?
Ron: It’s 225 Professor.
Voldemort: Unfortunately, it is incorrect. Anyone else?
Hermione: It’s 275 Professor.
Voldemort: Correct. Class, give her a round of applause.
Hermione: The product of 225 and 2 is only 450, Ron.
Ron: Right! I miscalculated.
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